The most common cause of COPD is long-term smoking or years of exposure to second-hand smoke.

VOA: standard.2010.06.21

He responds in the second paragraph of the letter in the left-hand column of the packet to this criticism that he's doing so little.

他在信左手边的第二段,对他做的如此至少的批评作出了回应。

耶鲁公开课 - 弥尔顿课程节选

The second teaching assistant--I see him right there, if you could raise your hand--Santosh Anagol, who is a representative of the United States, although he seems to have connections to India as well.

第二位助教,他就坐在这间教室里,请举起手来,桑托什·阿纳高,是一位来自美国的代表,虽然他看起来也有印度血统

耶鲁公开课 - 金融市场课程节选

In recent years, medical evidence has pointed to the harmful physical effects of second-hand smoke.

VOA: standard.2010.06.15

So in other words, if you live with a smoker, you really are at very high risk of demonstrating high levels of second-hand smoke exposure."

VOA: standard.2010.06.15

Dr.Mark Hamer's study on the psychological impact of second-hand tobacco smoke appears in the Archives of General Psychiatry, a journal published by the American Medical Association.

VOA: standard.2010.06.15

Although there is some evidence that artery damage caused by second-hand smoke in adults may be reversible, LaVan says it's unclear whether that's also true for adolescents.

VOA: standard.2010.03.04

They also found that people exposed to second-hand smoke - like smokers - were more likely to be admitted to a hospital for a psychiatric illness than people without the exposure to tobacco smoke.

VOA: standard.2010.06.15

A new study has found that teenagers who are exposed to second-hand tobacco smoke are more likely to have damaged to their blood vessels that could lead to heart disease later in life.

VOA: standard.2010.03.04