Now,a new study adds to evidence that non-smokers who live or work around smokers can experience psychological harm as well.

VOA: standard.2010.06.15

It's simple whether that you walk to work, or you take 20 minutes during your lunch break to walk around the gorgeous campus or town that we are live in.

这很容易做到，无论你是走路上班，还是每天午休时花上二十分钟,在美丽的校园,或是你所在的城市转一转。

普林斯顿公开课 - 人性课程节选