At the site of the crash, investigators spent hours combing through the mangled remains of the aircraft to find the plane's black box, flight-data recorder.

VOA: standard.2010.05.23

In the depressed phase, our thinking is narrow; we don't think outside the box usually-- of course there's many exceptions, but as a whole.

在抑郁阶段，我们的思维收窄;,我们失去创造力-,当然有例外，但总体而言没有。

哈佛公开课 - 幸福课课程节选

In the depressed phase, our thinking is narrow; we don't think outside the box usually-- of course there's many exceptions, but as a whole.

在抑郁阶段，我们的思维收窄;,我们失去创造力-,当然有例外，但总体而言没有。

哈佛公开课 - 幸福课课程节选