Proving the truth of the famous scientist Louis Pasteur's words "chance favours only the prepared mind", Perkin saw the potential of his unexpected find.

珀金看到了他的意外发现很有潜力，这印证了著名科学家路易斯·巴斯德的话“机会只青睐有准备的人”。

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But the operation of proving the truth is difficult in multiple relations of values.

但是在实践中的多元价值关系中，操作是不容易的事。

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The witness is irreplaceable by others for knowing the case details, and either is his testimony in proving the truth of the case.

证人因为对案情的知悉而不能被他人所代替，其证言在证明案件事实上具有不可替代性。

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This reflects an emerging truth about Mr Bush: he is proving a divisive president, unable to change the minds of a significant slice of his people.

ECONOMIST: Winners and losers in American politics