23.If we know more about what causes
endangerment, we may be able to take measures before it is too late. 如果我们能更多地了解致使生物濒危的原因,就能及时采取补救措施。
They are thinking of buying the house
before the prices go up. 他们正在考虑趁房价未涨时把房子买下来。
If you don’t like the present job, I
suggest you look for another one before it is too late. 如果你不喜欢目前的工作,我建议你趁早另谋出路。
He hung up before I could say a word. 我还没说一句话,他就挂了电话。
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