他针对吸二手烟的影响进行了一次严谨的实验。

He conducted a rigorous experiment on the effect of second hand smoking.

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我所担心的是实验中缺少严谨。

Take my concern about the lack of experimental rigor.

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新的实验将进行更严谨的测试。

The new trial will provide a sterner test.

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新的实验将进行更严谨的测试。

The new trial will provide a sterner test.

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