Scientists know that cancer may not show up for many years.

科学家们知道癌症可能会潜伏多年。

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That's scientists here to show the reality that we don't know without science.

科学家们告诉我们，没有科学知识而不知道的事实。

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That's scientists here to show the reality that we don't know without science.

科学家们告诉我们，没有科学知识而不知道的事实。

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