分类必应美图下的文章

Wat Phra Ngam，大城府历史公园，泰国 Wat Phra Ngam, Ayutthaya Historical Park, Thailand (© boonchai wedmakawand/Alamy Stock Photo)

一个π A piece of pi

圆周率日快乐!

有人这样说过，世界上唯一不变的是变化。然而，在数学里却有许多固定不变的常数，今天，我们要庆祝的也许是其中最著名的一个：π。圆周率是圆的周长与直径之比，约为3.14159。每年的3月14日，全世界的数学爱好者都会用烘焙来庆祝圆周率π日——这既是对数学常数π的庆祝，也是对其同音字，美味的“派”的庆祝。它始于1988年，当时物理学家拉里·肖将日期（3/14）与这个常数的前三位数联系起来。今天，数学家和爱好者们用吃派和背诵π来庆祝圆周率日。你知道吗，当你的时钟敲响1:59时，表示你离圆周率的实际值又近了三位小数。圆周率无处不在，甚至在大自然中也是如此。图中是泰国大城府寺庙的一棵菩提树，其形状就像圆周率的符号。无论你是数学怪才，还是只是为了享受美食，每个人都可以享受“派”节！

Happy Pi Day!

They say the only constant in life is change. In mathematics, however, there are many constants and today, we're celebrating perhaps the most famous of them all: pi. Represented by the symbol π, this tasty-sounding number is the ratio of a circle's circumference to its diameter, approximately 3.14159. Every March 14, mathematics fans across the world get baking to mark Pi Day with a pie. It began in 1988, when physicist Larry Shaw connected the date (3/14) with the first three digits of π. Today, mathematicians and enthusiasts celebrate Pi Day with pie eating and pi reciting. Did you know that when your clock strikes 1:59 today, you will be three decimal places closer to the real value of pi? Pi is everywhere, even in nature. Pictured here is a bodhi tree which has grown over an arch into the shape of the pi symbol at Wat Phra Ngam, a temple in Ayutthaya, Thailand. Whether you're a math geek or just in it for the treats, Pi Day is for everyone to enjoy!

小红鹳飞越马加迪湖,肯尼亚 Lesser flamingos flying over Lake Magadi, Kenya (© Vicki Jauron, Babylon and Beyond Photography/Getty Images)

鸟瞰 Bird's-eye view

马加迪湖，肯尼亚

多么不可思议的景色啊！这张航拍照片展示了以肯尼亚马加迪湖为背景的小红鹳群。小红鹳是六种火烈鸟之一，以其鲜艳的粉红色羽毛和独特的觅食行为而闻名。由于喙的构造，这些鸟喜欢在水面附近进食。它们主要栖息在碳酸盐浓度较高的非洲苏打湖。马加迪湖就是这样一个充满蓝藻和海藻的苏打湖，为火烈鸟提供了充足的营养。成千上万只火烈鸟聚集在湖边的壮观景象揭示了这些独特生态系统的重要性。

Lake Magadi, Kenya

What an unearthly view! This aerial photograph shows a flamboyance of lesser flamingos against the backdrop of Lake Magadi in Kenya. The lesser flamingo is one of six species of flamingo, a bird known for its vibrant pink plumage and distinctive feeding behavior. They use their specialized beaks to filter algae near the water's surface and are often found in African soda lakes like Lake Magadi, which are brimming with cyanobacteria and algae for them to eat. The spectacle of thousands of these avian wonders congregating at the lake reveals the importance of these unique ecosystems.

布莱斯峡谷国家公园，犹他州，美国 Bryce Canyon National Park, Utah (© Jim Patterson/Tandem Stills + Motion)

峡谷的守护者 Guardians of the canyo

布莱斯峡谷国家公园，犹他州

徒步是游览犹他州布莱斯峡谷国家公园这些迷人的红色石柱的最佳选择！公园里的徒步小径可以引导您穿行于世界上最大的石柱岩群之间，这些石柱是由侵蚀作用形成的岩石尖顶。这些马蹄形的天然露天剧场会随着阳光的照射而变化，营造出了一种超现实的景观。该地区最初居住着美洲原住民部落，包括派尤特人。虽然没有证据表明他们曾在此长期居住，但派尤特族印第安人曾利用庞沙冈特高原进行季节性狩猎和采集。布莱斯峡谷于1928年被指定为国家公园，峡谷内分布着多个观景点，如灵感点、约文帕点和彩虹点，可将周围的景致尽收眼底。

Bryce Canyon National Park, Utah

These fascinating red hoodoos of Bryce Canyon National Park in Utah are best explored on foot! The park's hiking trails guide you among the world's largest collection of hoodoos, which are rock spires formed by erosion. The horseshoe-shaped natural amphitheaters create a surreal landscape that changes with the play of sunlight. The area was initially inhabited by Native American tribes, including the Paiute people. Although there is no evidence of them having lived there permanently, Paiute Indians used the Paunsaugunt Plateau for seasonal hunting and gathering. Designated a national park in 1928, Bryce Canyon is dotted with several viewpoints like Inspiration Point, Yovimpa Point, and Rainbow Point, which offer panoramic vistas of the surrounding topography.

Prosecco山丘，科内利亚诺和瓦尔多比亚德内，威内托大区，意大利 (© Richard T. Nowitz/Getty Images)

醉人的山峦

Prosecco山丘，科内利亚诺和瓦尔多比亚德尼

科内利亚诺和瓦尔多比亚德内的Prosecco丘陵是大自然与人类智慧完美结合的地方。由于其独特性，这些山丘已被联合国教科文组织列入世界遗产名录。特殊的丘陵地带给该地带来了由葡萄园和树林构成的有机环境。而在马赛克般的景观中脱颖而出的小村庄和葡萄园，却只是让这个地方显得独一无二的部分因素。

如果您想领略这迷人的景色，又想进行一次远足，您可以选择Prosecco丘陵之旅。这是一条长达50公里的小路，周围的景色堪比童话世界。一路上，您可以欣赏到位于狭长的草地梯田上的小葡萄园、壮丽的山脊和富有特色的村庄。此外，您还可以品尝到著名的Prosecco葡萄酒，并参观17世纪乡村建筑的经典之作：克罗达水磨坊。

伊瓜苏大瀑布鸟瞰图，巴西 (© Nido Huebl/Shutterstock)

世界新七大自然奇观之一

伊瓜苏大瀑布，巴拉那州

伊瓜苏大瀑布以其宏伟且独特的美景吸引着游客，是南美洲最令人印象深刻的自然宝藏之一。这个壮观的瀑布位于巴西和阿根廷的交界处，不仅是一个不可错过的旅游景点，也是全球公认的瑰宝。1986年，伊瓜苏大瀑布被联合国教科文组织评为世界遗产，并被世界新七大奇迹基金会评选为世界七大自然奇观之一。

瀑布所在的伊瓜苏国家公园是一个广阔的环境保护区，拥有丰富的生物多样性。在公园的小径和人行道上游览时，游客有机会目睹各种野生动物，包括美洲豹、水豚和各种热带鸟类。

比斯第恶土，新墨西哥州，美国 Bisti/De-Na-Zin Wilderness Area, New Mexico (© Ian Shive/Tandem Stills + Motion)

因时间而改变 Transformed by time

新墨西哥州比斯第恶土

时间是伟大的变革者，它改变着世界，也改变着我们所有人。例如，新墨西哥州的这片名为比斯第恶土的荒地，曾经是一片郁郁葱葱的热带森林。近7000万年前，这里没有扭曲的地形和高耸的尖塔，而是一群白垩纪晚期恐龙的家园，包括甲龙、鸭嘴龙和强大的霸王龙。如今，这里到处都是另一种奇观，岩层看起来更像是雕塑，而不是自然现象。比斯第恶土的名字“Bisti/De-Na-Zin”是以纳瓦霍语命名的：“Bisti” 的意思是 "在土坯岩层中"，“De-Na-Zin” 则来自附近的 "站立的仙起重机"石刻。来到四角地区的游客一定不要错过这片由页岩和砂岩组成的超凡脱俗的景观。

Bisti/De-Na-Zin Wilderness, New Mexico

Time is the great transformer, changing the world and all of us. For instance, this New Mexico badland—the Bisti/De-Na-Zin Wilderness—was once a lush, tropical forest. Nearly 70 million years ago, instead of twisted terrains and towering spires, this place was home to an array of Late Cretaceous dinosaurs, including armored Ankylosaurs, duck-billed Hadrosaurs, and mighty Tyrannosaurs. Today, the area is filled with wonders of a different kind, rock formations that look more like sculptures than natural phenomena. Bisti/De-Na-Zin is named after Navajo words: Bisti means 'among the adobe formations,' and De-Na-Zin means 'standing crane,' a reference to nearby rock carvings of the bird. Visitors to the Four Corners region shouldn't miss out on this otherworldly landscape of shale and sandstone.

Roques de Benet，埃尔斯港自然公园，加泰罗尼亚，西班牙 Roques de Benet, Els Ports Natural Park, Catalonia, Spain (© Sergi Boixader/Alamy Stock Photo)

攀登新的高峰 Reaching new heights

Roques de Benet，埃尔斯港自然公园，西班牙

奇特的山峰耸立在埃尔斯港自然公园的上空，这是一组位于西班牙加泰罗尼亚地区波特斯德托尔托萨贝塞特山的岩石群。这组岩石群里最高的山峰海拔约3,330英尺，从山顶上俯瞰埃布罗三角洲，可以看到溪流和松树林，还有通往山中的小径。该山的名字中包含“Benet”一词，这个词源于阿拉伯语，暗示着该地区有着丰富多彩的过去。如今，埃尔斯港自然公园是各种动物的家园，从野生山羊和水獭到秃鹫和老鹰，园区内物种丰富。不过，动物并不是该地区唯一的“居民”。山脚下还坐落着一个具有社区意识的村庄，村民们仍然保持着共同的传统，例如使用植物纤维来制作篮子和厨房用具的古老工艺。

Roques de Benet, Els Ports Natural Park, Catalonia, Spain

Jutting into the sky above Els Ports Natural Park, the Roques de Benet are a cluster of rock formations in Catalonia, Spain, whose tallest peak stands about 3,330 feet above sea level. Overlooking the vast wetlands of the Ebro Delta, the peak offers views of streams and pine forests, with trails that lead into the mountains. The word 'Benet' comes from Arabic, hinting at the area's varied past, including both Arabic and Christian settlers. These days, the park is home to a variety of wildlife, from ibex and otters to vultures and eagles. Animals aren't the only inhabitants of the area. The villages nestled at the base of this massif still maintain their shared traditions, such as the age-old craft of using vegetable fibers to create baskets and kitchen utensils.

尽情地嬉戏玩水吧！ Get your splash on

瓦克莱拉瀑布，俄勒冈州

在俄勒冈州一处狭缝型峡谷的尽头，有一个特别的地方正等待着徒步旅行者去探索：瓦克莱拉瀑布。其水源来自哥伦比亚河的支流坦纳河，这个瀑布的名字是由马扎马登山俱乐部的成员以美国原住民村庄的名字命名的。走到步行道的尽头，游客可以观赏到壮观的两级瀑布，水流从350英尺高的地方坠落到下面的水潭中，而这个水潭正是一个绝佳的玩水、纳凉胜地，当你在里面游泳的时候，可别忘了留意附近的水鸫（也被称为美洲河乌），这是一种以瀑布为家的鸟类。人们可以看到它们沿着溪流飞翔，偶尔也会潜入水中。

Wahclella Falls, Oregon

Nestled in the Columbia River Gorge in Oregon, there's something special awaiting hikers: the Wahclella Falls. Fed by Tanner Creek, a tributary of the Columbia River, these waterfalls were named after a Native American village by members of the Mazama Mountaineering Club. At the end of a trail, visitors can see the spectacular two-tiered cascade that crashes down 350 feet into a pool below, which is the perfect place to take a dip and cool off. While you're swimming, keep an eye out for the water ouzel—also known as the American dipper—a species of bird that lives here. They can be spotted flying along the stream and occasionally diving into the water.

陷入循环之中？ Stuck in a loop?

曼谷，泰国

在生机勃勃的泰国，曼谷这座城市充满了活力！这是一座占地面积超600平方英里的城市，其常住人口预估超过1000万人，占泰国总人口的15%以上。作为泰国的首都，曼谷拥有繁华的城市基础设施，而复杂的交通圈和高速公路网正是其特色。1864年竣工的石龙军路，是曼谷第一条利用现代方法铺设的马路。石龙军路的建成亦是曼谷历史上的重要节点，曼谷的主要交通方式自此从水上交通向陆路交通转变。而1972年引入的复杂的高架快速路网和廊曼收费公路的建成则使得开车进出城更加方便。多年来，曼谷的交通网络在不断地发展，以满足城市扩张的需求。

Bangkok, Thailand

In vibrant Thailand, the city of Bangkok pulses with life! Covering an area of more than 600 square miles, it is estimated that over 10 million people live there, roughly 15% of the country's population. The capital city is home to a bustling urban infrastructure, featuring a complex network of traffic circles and highways. In 1864, the completion of Charoen Krung Road marked a turn in the city's transit by serving as a pioneering construction project utilizing Western techniques. The introduction of a complex elevated expressway network in 1972 and the Don Mueang Tollway has made it easier to drive in and out of the city. Over the years, the road network has evolved to meet the demands of this sprawling urban expanse.

睡美人 A sleeping beauty

睡美人

热带国家哥斯达黎加在向你招手！图中展示的圆锥形的阿雷纳尔火山高达5437英尺，屹立于周围的热带雨林以及该国最大的湖泊阿雷纳尔湖之上。1968年，在一次大规模的喷发中，这座沉睡的火山咆哮着苏醒了，当时的岩石飞溅了半英里多。而最近一次的大规模火山活动发生在2010年，如今，这座曾被熔岩照亮过山峰正处于休眠状态。对于观鸟者而言，阿雷纳尔火山国家公园是一个必游之地，公园内拥有500多种鸟类，除此之外，该公园还是各种动植物的家园，包括赤短角鹿、美洲狮、白脸卷尾猴、兰花、蝎尾蕉和蕨类植物。高高的阿雷纳尔火山俯瞰着这些热带树木，形成了一副壮观而美丽的风景。

Arenal Volcano, Costa Rica

Greetings from tropical Costa Rica! The conical Arenal Volcano rises to an impressive height of 5,437 feet, standing tall above the surrounding rainforest and Lake Arenal, the largest lake in the country. The sleepy mountain roared to life in a massive 1968 eruption that buried about 6 square miles under rocks, lava, and ash and devastated three villages. The last significant volcanic activity there took place in 2010, and the once lava-lit peak is currently dormant. With over 500 species of birds, Arenal Volcano National Park is a must-visit location for birdwatchers. The park is also home to a diverse range of flora and fauna, including red brocket deer, pumas, white-faced monkeys, orchids, heliconias, and ferns. Arenal makes for an imposing and beautiful sight, towering over the tropical trees.

星空迷