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1·How risky is secondhand smoke?

二手烟到底有多危险？

2·How can secondhand smoke be avoided?

该如何避免吸入二手烟？

3·Avoid secondhand smoke.

避免吸二手烟。

4·000 nonsmokers die every year from secondhand smoke.

每年有5万3千名非吸烟者死于二手烟。

5·Studies of secondhand smoke have indeed moved outdoors.

二手烟的研究确实已经移至户外。

6·It's been scientifically proven that secondhand smoke is dangerous.

科学已经证实抽二手烟是十分危险的。

7·So Repace is correct that secondhand smoke has been studied outdoors.

所以Repace在户外做的二手烟研究是对的。

8·Because secondhand smoke is very harmful, especially for children.

二手烟会危害人体健康，特别是对抵抗力弱的小孩子。

9·It is not yet clear how secondhand smoke would trigger mental troubles.

二手烟如何能引起精神疾病还不清楚。

10·High concentrations of many of these chemicals are found in secondhand smoke.

研究发现二手烟中含有高浓度的上述有害物质。