“火流”马尾瀑布，约塞米蒂国家公园，美国加利福尼亚州 'Firefall' on Horsetail Fall, Yosemite National Park, California (© Jeff Lewis/Tandem Stills + Motion)

“火流”马尾瀑布，约塞米蒂国家公园，美国加利福尼亚州 'Firefall' on Horsetail Fall, Yosemite National Park, California (© Jeff Lewis/Tandem Stills + Motion)

这个悬崖怎么着火了？ Why is this cliffside ablaze?

马尾瀑布，约塞米蒂国家公园，加利福尼亚州

在约塞米蒂国家公园的埃尔卡皮坦山东侧，当所有自然条件齐备，马尾瀑布就像火一样“燃烧”起来。这种现象只有在2月的几周时间里可以看到，前提是天气晴朗，雪水或雨水形成瀑布，并且光照条件恰到好处。“火瀑布”只会持续大约10分钟，届时，观景区会人潮涌动。希望今年的游客能有幸看到这一神奇的自然景观。

Horsetail Fall, Yosemite National Park, California

When nature converges in rare and glorious fashion on the east side of the rock formation known as El Capitan, Horsetail Fall is illuminated as if on fire. This phenomenon can only be seen for a couple of weeks in February if there is a clear sky, enough water flowing from snowmelt or rain, and perfect timing. This 'firefall' only lasts for around 10 minutes and vantage points can be crowded. Horsetail Fall and El Capitan are part of Yosemite National Park, the second-oldest national park in the US. We hope this year's visitors are fortunate enough to see this magical display.