到底究竟该如何选购一款合格的净水器产品，为此记者采访了相关部门。

In the end exactly how to choose a qualified water purification products, this reporter interviewed the relevant departments.

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到底什么是进化论，它究竟是怎样工作的？

So just what is evolution, and how does it work?

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挖掘这类信息，或许也会因此揭示出观念到底如何传播，趋势究竟怎样产生。

Mining this sort of information might therefore also reveal information about exactly how ideas are spread and trends are set.

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