Tom doesn't have a ping-pong ball.

汤姆没有一个乒乓球。

youdao

It's a ping-pong ball.

这是一个乒乓球。

youdao

Here we have not a bowling ball onto a ping-pong ball but we have a billiard ball.

我现在不让保龄球，去撞乒乓球，而是拿一个台球。

youdao

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

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

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