At first we were in front of them. Then we fell behind.
起先我们在他们前面，后来落后了。
We thought the horse would win, but he fell behind halfway through the race.
我们曾认为这匹马会取胜，可是他在比赛中途落后了。
As we were progressing, someone among those who had learned English before fell behind.
随着程度的提高，原来学过英语的人有些却成了落后分子了。
He fell behind when we were climbing the mountain.
我们爬山时，他掉队了。
He fell behind when we were climbing the mountain.
我们爬山时，他掉队了。
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