And later on if you right before or right during you give the dog some food you--you ping a bell the bell will cause the saliva to come forth.

,在喂食前或者喂食过程中,你摇铃,铃声就会加速唾液的分泌。

耶鲁公开课 - 心理学导论课程节选

It's not going to be a backscatter event if your ping-pong ball hits the frame or these strings, or the top part.

打到原子核了就是背散射,如果打到框上。

麻省理工公开课 - 化学原理课程节选

So, it'll be considered a backscatter event if your ping-pong ball hits one of the nuclei.

什么情况是背散射,如果你们的乒乓球。

麻省理工公开课 - 化学原理课程节选

Raise your hand if you don't if you don't have a ping-pong ball yet.

这样就可以算,背散射的概率了。

麻省理工公开课 - 化学原理课程节选

We have 266 ping-pong balls, and we need someone, hopefully you, to be some radioactive material that are going to be emitting these ping-pong balls. And when the time comes, in just a minute, I'll ask the TAs to come down and hand these out very quickly to you, so we can do this experiment.

你们有些人那天，看到我在办公室数乒乓球，我们需要几个人,希望是你,来作为放射材料，放射这些乒乓球,等会我会让助教,把这些球发给你们。

麻省理工公开课 - 化学原理课程节选