Some wore headsets; others talked into phones; two balding men in brown suits jabbered in some clipped foreign tongue, hands poking the cold air.

有些人塞着耳机，有些人在打电话，两个穿着褐色套装的秃头男人飞翻着外国口音含糊不清地闲谈，在寒冷的空气中指指戳戳。

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Shifting rain patterns flood some regions and dry up others as nature demonstrates a grave physics lesson: Hot air holds more water molecules than cold.

降雨模式的改变导致一些地方洪水泛滥，一些地方又闹起了旱灾，所有这些都告诉我们这样一个物理规律：热空气中水分子数量比冷空气中水分子数量要多。

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Some runners may experience throat irritation if they breathe cold air directly—avoid this by wearing and breathing through a scarf or ski mask.

如果直接吸入冷空气，可能会觉得咽喉疼痛。 可以透过围巾或者滑雪口罩呼吸。

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Unstable means that if an imaginary balloon filled with air from near the ground were to be lifted upward, colliding with some weather feature such as a cold front, the "balloon" would become warmer than the surrounding air at that level.

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