adj.幼稚的，孩子气的，不复杂的
She's just being childish and immature.
她在耍小孩子脾气，真是任性。
Don't be so childish!
别那么幼稚！
We eventually ran out of patience with his childish behaviour.
我们终于对他幼稚的行为忍无可忍.
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