I thought I wasgoing back to Vietnam, but instead they decided the best way for meto fight the Communists was to play Ping-Pong, so I was in the special Services, traveling around the country, cheering up wounded veteransand showing'em how to play Ping-Pong.

VOA: standard.other

So, 13 backscattered. TAs, if you can maybe pick up these ping-pong balls for me.

把这些球捡起来，我觉得如果，我摔倒一定很搞笑。

麻省理工公开课 - 化学原理课程节选