Oh, don't be so childish! Cheer up!
哎呀，别这么孩子气！振作起来！
Never act childish and be a maverick, be someone who takes an individual stand.
不要幼稚或疯狂行事，做一个有个人立场的人。
A: Behave yourself, Tom. Don't be so childish.
规矩点儿，汤姆，别这么孩子气。
He never dreamed that his request would be laughed off as a childish fancy.
他做梦也没想到，他的要求被当成幼稚的幻想而一笑置之。
Why people can not be pure and childish when they grow up?
为什么人长大了就不能单纯不能幼稚了呢？
Don't be so childish, it'll only make the situation more complicated.
别这么孩子气，这将只会使情况更加复杂。
Don't be so childish if you think you can get something for nothing.
别这么孩子气，如果你认为你能够不劳而获。
But this is apparently a country that must be spoken to in childish ways.
显然，这是用一种小孩子的口吻对全美国人说话。
But this is apparently a country that must be spoken to in childish ways.
显然，这是用一种小孩子的口吻对全美国人说话。
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