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。
Exposure to second-hand tobacco smoke is also dangerous.
接触二手烟草烟雾也是危险的。
Help protect non-smokers from exposure to second-hand tobacco smoke; and.
帮助保护非吸烟者避免接触二手烟草烟雾；以及。
Help protect non-smokers from exposure to second-hand tobacco smoke; and.
帮助保护非吸烟者避免接触二手烟草烟雾；以及。
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