No secondhand smoke production.
无二手烟的产生。
In particular, their odds of being sensitized to cat dander were double that of children with no secondhand smoke exposure at 2 months of age.
特别是，他们对猫毛屑过敏的几率是2个月大未被动吸烟儿童的两倍。
There is no safe level of secondhand smoke for nonsmokers. Don't expose your children to secondhand tobacco smoke.
别让你的孩子吸二手烟。
There is no risk-free level of exposure to secondhand smoke.
没有风险的二手烟含量是不存在的。
"This means that no level of smoking, or exposure to secondhand smoke, is safe," says Dr.
“这意味着零吸烟水平或不接触二手烟是安全的，”Crystal博士说。
The surgeon general says there is no safe level of exposure to secondhand smoke.
外科主治医生说没有对揭漏的被动吸烟的安全级别定论。
The surgeon general says there is no safe level of exposure to secondhand smoke.
外科主治医生说没有对揭漏的被动吸烟的安全级别定论。
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