One chilly night when I was hiking in the Rocky Mountains with some students, I mentioned that we were going to cross a mountain stream.
一个寒冷的夜晚，当我和几个学生在落基山脉徒步旅行时，我提到我们将要渡过一条山间小溪。
It gets quite chilly in the mountains at night.
夜晚山里头会变得挺冷的。
It's extremely chilly in the mountains at night.
半夜的深山里极其寒冷。
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