That's juvenile
Max在电话中假装是自己的奶奶,编造了一堆??有神的理由,譬如“My granddaughter Max died. On her deathbed, she said it was the stress of being constantly harassed by creditors. 我的孙女Max已经死了。咽气前,她说是被讨债公司长期的骚扰给逼死的。)”
善良的Caroline看不过眼,哪有人咒自己死的?她插嘴到:“That's juvenile”。这里juvenile作形容词,相当于childish,表示“幼稚不成熟的、很傻很天真的”。

形容某种幼稚的行为可以用juvenile behavior。例如:Some people don't like April Fool's Day, because they think fooling others is a juvenile behavior. 有人对愚人节不感冒,因为他们觉得愚弄他人是种幼齿的行为。
“Don't be so juvenile.”则是劝告他人不要太孩子气。
此外有一个固定搭配是juvenile delinquency,指“青少年犯罪”,如They held a forum on juvenile delinquency last month. 上月他们举办了一个有关青少年犯罪的论坛。
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