You should not behave childishly at your age.

在你这个年龄做事不应该孩子气。

youdao

Stop childishly messing around.

别孩子气般地捣乱。

youdao

How childishly I was! I am very sorry for my early thought.

我实在是太幼稚了！我为自己那时的想法感到内疚。

youdao

How childishly I was! I am very sorry for my early thought.

我实在是太幼稚了！我为自己那时的想法感到内疚。

youdao