imperative (必須の): It is imperative to wear a seatbelt while driving. (運転中はシートベルトを着用することが必須です) - 試験に出る! 英単語検索辞書

imperative (必須の): It is imperative to wear a seatbelt while driving. (運転中はシートベルトを着用することが必須です)

It is imperative to wear a seatbelt while driving.