When I had waited a long time, without hearing him lie down, I decided to open a little -- a very,very little -- crack in the lantern.

VOA: special.2009.05.16

It's very unlikely any of you would either but they go a long time without food, suggesting they do not want to cause this other chimpanzee pain.

你们也不会,但它们忍了很长时间才吃，这表明它们不想造成另一个黑猩猩受苦。

耶鲁公开课 - 心理学导论课程节选