According to a study, a large number of people, particularly smokers, have no idea that the third-hand smoke is a health hazard for people.
据研究，许多人，尤其是烟民，都不知道三手烟会危害人们的健康。
According to a study, a large number of people, particularly smokers, have no idea that the third-hand smoke is a health hazard for people.
据研究，许多人，尤其是烟民，都不知道三手烟会危害人们的健康。
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