披着一层霜花的秋叶 Autumn leaves coated with frost (© sagarmanis/Getty Images)

披着一层霜花的秋叶 Autumn leaves coated with frost (© sagarmanis/Getty Images)

Frost on autumn leaves

You can almost hear the sound of autumn leaves coated in frost as they crunch under your shoes on a walk through the woods. Though the calendar says it's still autumn, scenes like this highlight the colder temperatures as winter arrives in the Northern Hemisphere.

Radiation frost—the type seen in this lovely photo—is a quick transformation of water vapor to ice. When water vapor in the air comes into contact with surfaces that are at or below the freezing point, the vapor quickly crystalizes into frost. It can make for charming scenery, or a reminder that you should have worn a heavier jacket.

秋叶霜

在树林里散步时，你几乎可以听到被霜冻覆盖的秋叶在你的鞋下嘎吱作响的声音。虽然日历上说现在仍然是秋天，但像这样的场景突出了北半球冬天来临时的寒冷温度。

在这张可爱的照片中看到的辐射霜类型是水蒸气迅速转变为冰。当空气中的水蒸气与冰点或冰点以下的表面接触时，水蒸气迅速结晶成霜。它可以创造迷人的风景，或者提醒你应该穿一件更厚的夹克。