The surgeon general says there is no safe level of exposure to secondhand smoke.
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。