R-6:roll in the alsles 乐不可支
A:What's up? Why are they rolling in the aistes?
A:出什么事了？他们为什么捧腹大笑？
B:I told them a joke just now.
B：我刚才给他们讲了个笑话。
A:Don't you know we are having a class now? Aren't you ashamed of your behavior?
A：你不知道我们在上课吗？你不为你的行为感到羞耻吗？
