He was by nature a spirited little boy.

他天生就是个充满活力的小男孩。

《柯林斯英汉双解大词典》

Naughty is the nature of a boy.

淘气是男孩子的本性。

youdao

Tom, a very clever boy by nature, is being silly today.

汤姆原本是个聪明的男孩，今天怎么傻了。

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Tom, a very clever boy by nature, is being silly today.

汤姆原本是个聪明的男孩，今天怎么傻了。

youdao