他们的看法是，他在政治上曾是幼稚的。

Their view was that he had been politically naive.

《柯林斯英汉双解大词典》

他们嘲笑他提的建议太幼稚。

They laughed at the naivety of his suggestion.

《牛津词典》

彼得-潘和小叮当的婚礼很美，不过希望在这之后他们就能摒弃儿童的幼稚，用心经营婚姻生活。

This Peter Pan and Tinkerbell wedding is beautiful, but hopefully it will stop them from their childish games to make the marriage work.

youdao

Well, they weren't ignorant undergraduates, but beyond that they drank wine, not those barbarian liquids that you drink, and also they mixed that wine with water, so that it shouldn't get them drunk too fast.

他们可不是幼稚的大学生,他们喝的是美酒,而不是你们喝的那种野蛮液体,同时他们也把酒和水兑在一起喝,这样他们就不至于很快醉倒

耶鲁公开课 - 古希腊历史简介课程节选