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Second hand smoking has been recognized harmful to other people.
二手烟已经被确认对其他人有危害。
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He conducted a rigorous experiment on the effect of second hand smoking.
他针对吸二手烟的影响进行了一次严谨的实验。
youdao
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He conducted a rigorous experiment on the effect of second hand smoking.
他针对吸二手烟的影响进行了一次严谨的实验。
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