姜浩得意地撇了一下嘴，却看到其他同学都在捂着嘴，强忍着不笑出声来。

Jiang felt happy, but soon he realized that other students were trying to hold back their laughters.

youdao

如果你是右撇子，试一下这个实验：用你的左手拿一把刀，把一个西红柿切碎。

If you are right handed, try this experiment: Take a knife with your left hand and try cutting a potato into pieces.

youdao

By the way, when you guys do this, did anybody notice prime?

顺便问一下,你们刚才听课的时候,有人注意要加撇吗

耶鲁公开课 - 基础物理课程节选