She is studying hard for fear that she should lag behind others.
她学习很刻苦，唯恐落在别人后面。
She is working hard for fear (that) she should lag behind others.
她很用功，唯恐落在别人后面。
Perhaps personality dictates, her heart Victory particularly strong, not willing to lag behind others, treat their own requirements too stringent.
也许是性格使然，她的好胜心特别强，不愿意落后于人，对待自己要求太过严格。
Soon one horse began to lag behind the others.
很快一匹马开始落后于同类。
If we walk slower than the others we shall lag behind them.
如果我们比其他人走得慢，我们就会落在他们后面。
If we walk slower than the others we shall lag behind them.
如果我们比其他人走得慢，我们就会落在他们后面。
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