You should not behave childishly at your age.

在你这个年龄做事不应该孩子气。

youdao

At times like that the instinctive reaction is to childishly and peevishly cast around in search of somebody else to blame, but the real truth is self-evident and undeniable.

在这种时候，本能的反应是像小孩子一样找一个人来出气，但是事实不争自明，不可否认。

youdao

Then he hoped, childishly, that it had been a dream, that Ron was still there and had never left.

他天真地希望那是个梦，希望罗恩还在这儿，没有离开。

youdao

"The commercial is an utterly offensive, childishly obvious attempt to resuscitate a badly battered reputation for purely commercial purposes with what I'm sure somebody imagines to be one 'bold stroke, '" says Martin Puris, a longtime ad agency executive who is now CEO of Engine USA, an integrated communications company in New York.

FORBES: Reputation Management