二手烟èrshǒuyānMeanings1. second-hand smokeCharacters used二two手hand烟tobaccoExamples1在zàiJohnson的de调查diàochá里lǐ，明确míngquè地de证明zhèngmíng了le二手烟èrshǒuyān是shì很hěn有害yǒuhài的de。It is clearly shown in Johnson's investigation that passive smoking is very harmful.