实践检验认识，有一个成本问题，就是人类用实践检验认识时所付出的代价。
In the fact that practice tests knowledge there exists the cost, i.
最后，该指南经由受邀志愿者在实践中检验，这些志愿者用其评价现有的HIA证据。
Finally, the guide was tested in practice by invited volunteers who used it to appraise existing HIA evidence reviews.
我们需要更多力量和智慧用重大政策问题实践对理论进行检验。
We need more hands and minds to confront theory with evidence on major policy issues.
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