He won't be able to catch up with us unless he runs faster.
他不可能赶上我们，除非他跑得更快一些。
We must redouble our efforts, or we'll never be able to catch up with the others.
我们必须加倍努力，否则将再也赶不上别人了。
You will be able to catch up on overdue paper work.
你能完成早该完成的文书工作。
I study hard, I will be able to catch up with my classmates.
如果我努力学习，我就能赶上别的同学。
You must strive to work harder, otherwise you won't be able to catch up with your classmates, I am afraid.
你必须加紧努力，否则我怕你会赶不上同班同学。
You must strive to work harder, otherwise you won't be able to catch up with your classmates, I am afraid.
你必须加紧努力，否则我怕你会赶不上同班同学。
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