2. 专升本
  3. It is vital that scientists should perceive the danger now before it is too late.

It is vital that scientists should perceive the danger now before it is too late.

admin2012-05-24  43
问题 It is vital that scientists should perceive the danger now before it is too late.
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答案重要的是，科学家们现在就应该觉察到危险，否则就为时太晚了
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