There is no safe level of exposure to second-hand tobacco smoke.
关于二手烟草烟雾，不存在安全接触水平。
There is no safe level of second-hand tobacco smoke.
二手烟草烟雾没有安全标准。
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。
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。
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。
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