但这个学期我后退了。
Relieved, I let the book fall behind a stone.
我任由那书本掉落在一块石头后面，很释怀。
With your help, I didn't fall behind others.
在你的帮助下，我并没有落后于别人。
I was afraid to fall behind others.
我怕被别人落下。
I am afraid to fall behind with others in the exam.
我害怕在考试中落后于其他人。
My feet hurt. I will fall behind the others.
我腿疼，我要落在别人后面了。
I am afraid that I will fall behind others in the exam.
我害怕在考试中落后于其他人。
Many active ideas will be produced because I am unwilling to fall behind.
因为不甘落后，所以总会不断产生积极的想法。
With her help, I didn't fall behind in study.
与她的帮助，我没有落后的研究。
With her help, I didn't fall behind in study.
与她的帮助，我没有落后的研究。
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