1、Stop childishly messing around.
別孩子氣般地搗亂。

2、You should not behave childishly at your age.
在你這個年齡做事不應該孩子氣。

3、The special relationships of the world are destructive, selfish and childishly egocentric.
世俗中的特殊關系常是自私、幼稚、自我中心，而且頗具破壞性的。

4、He hit back angrily, saying such remarks were childishly simplistic.
他憤怒地反擊，說這些話太過幼稚。

5、It is not just insulting, it's also childishly simplistic.
這不僅帶有欺侮性，而且幼稚、簡單化。

6、How childishly I was! I am very sorry for my early thought.
我實在是太幼稚了！我為自己那時的想法感到內疚。

7、My daughters have really been acting childishly lately.
最近，我兩個女兒都在耍小孩脾氣。