I'm afraid we can't work out the math problem unless the teacher helps us.
如果老师不帮助我们，恐怕我们解不出这道数学题。
If you can't work out the math problem in this way, why not try doing it in another way.
如果用这种方法你解不出这道数学难题，为什么不试着换一种方式呢？
If you can't work out the math problem in this way, why not try doing it in another way.
如果用这种方法你解不出这道数学难题，为什么不试着换一种方式呢？
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