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。

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You should learn from insects when they try to cross a wall, they fall down again and again until at some time they get success.

你应该向昆虫学习，当它们试图越过一堵墙时，它们会一次又一次地倒下，直到某个时候它们成功了。

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But when they cross a busy road by using a zebra crossing, the traffic is held up.

但是当他们利用斑马线通过繁华的马路时，交通就被阻碍了。

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To combat the growing problem, Ensalaco said in late October the U.S.Federal Bureau of Investigation (FBI) initiated Operation Cross Country IV, a nationwide crackdown on human trafficking.

VOA: standard.2009.11.13

She proceeded to fairly rapidly go down the list, with minimal explanation, placing next to each item either a check (good) or a cross (bad).

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Congo's has a catanga cross (a large copper cross), while Equatorial Guinea has a pair of cowrie shells.

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