The manager warned that juvenile jokes in client emails could damage our professional image.

經理警告，在給客戶的電子郵件裡開幼稚的玩笑，可能會損害我們的專業形象。

His juvenile behavior during the budget meeting annoyed several senior executives.

他在預算會議上的幼稚行為惹惱了好幾位高階主管。

The hiring committee rejected him after his juvenile response to a simple interview question.

他對一個簡單的面試問題回答得很幼稚，招聘委員會因此沒有錄取他。