鉴于这些不确定性，医生并未开这种检查单，但这一情况现在可能会改变，因为如果使用得当，这一检查被证实是有效的，时代周刊说。
Given these uncertainties, doctors don't prescribe the tests, but that could change now that they've been proven effective if used properly, the Times says.
但如果使用得当，所有这些有毒化合物都不会形成危害。
Yet all of these hazardous substances pose little risk if used properly.
我举双手赞成客户调查，但前提是要使用得当，要通过它发现消费者观点的整体趋势。
I'm all for surveys, if they're being used the right way, as tools to identify general trends in terms of perception.
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