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。
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。
This activity also corresponded to the hand that the volunteer used when smoking.
人们了解到这些部分是用来解释和操控手部活动的。
On the other hand, smoking pollutes the air.
另一方面，吸烟造成空气污染。
On the other hand, smoking pollutes the air.
另一方面，吸烟造成空气污染。
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