• "I wish there were more people like him putting a spotlight on how important it is to volunteer, to just help one another, try to put yourself in somebody else's position."

    VOA: standard.2010.07.06

  • OK. We're going to just try this one more time just so you can see it.

    好的,我们将要再尝试一次,这样你们就可以看到它。

    麻省理工公开课 - 化学原理课程节选

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