Definitions

[1] n. 命令, 必要的事, 规则, 祈使语气

[2] adj. 命令式的, 急需的, 势在必行的, 强制的

[3] [医] 难忍的, 强制的

[ im'perәtiv ]

1. It is imperative for you to act at once.
   你必须马上行动。
2. It is imperative for you to finish by Sunday.
   你必須在星期日前完成。
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