secondhand smoke

secondhand-smoke的词性：
n.（名词）

1. Cigarette, cigar, or pipe smoke that is inhaled unintentionally by nonsmokers and may be injurious to their health if inhaled regularly or continuously over a long period.
被动吸烟：不吸烟的人无意间吸入的卷烟、雪茄或烟斗里的烟，如果在一段较长时间内有规律或持续地被动吸烟会对他们的健康造成损害