Each year in the United States, secondhand smoke kills an estimated 46,000 nonsmokers from heart attacks.

VOA: special.2009.01.07

But the Haight Street area, there's a lot of secondhand stores,

但在海特街，有很多二手店，

旧金山的时尚达人 - SpeakingMax英语口语达人

Adults may think they are protecting children from secondhand smoke when they smoke outside their home or only when the children are not there.

VOA: special.2009.01.07

The World Health Organization estimates that secondhand smoke kills six hundred thousand people each year.

VOA: special.2010.03.09

Over the long term, secondhand smoke also raises the risk of disease in nonsmokers.

VOA: special.2009.01.07

Secondhand smoke also causes breathing infections in young children.

VOA: special.2009.05.27