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act up
捣乱，表现不好
His little boy is 3 and likes to act up in front of others.
他的小孩3岁，人来疯。

talkative /ˈtɑː.kə.t̬ɪv/
爱说话的，健谈的；
My boss is so talkative that nobody likes to talk to him.
我老板太能说了，没人喜欢和他说话。

chatty /ˈtʃæt̬.i/
爱闲聊的；健谈的
You're very chatty today. What's the problem?
你今天很能说啊，咋了？

mouthy /ˈmaʊ.ði/
多嘴的
Ben used to be a mouthy young boy.
Ben过去是个爱插嘴的少年。

chatterbox
话多的人
chatterbox 话多的人（尤指小孩）
She hardly said a word until she was two, but now she's a little chatterbox.
直到2岁她都不怎么说话，但她现在是个小话匣子。