At a photo session with Mr.Arias, a Nobel peace laureate tasked by the OAS with mediating the conflict, Clinton said it is imperative that Mr.Zelaya's return not lead to violence.

VOA: standard.2009.09.22

but it is imperative that you do not forget things as simple as brushing your teeth.

但不要忘记像刷牙这样的小事也是必须的。

Make sure 实战 - SpeakingMax英语口语达人

Mr.Major says it is imperative for the inquiry to determine whether Blair's cabinet knew that there were serious doubts about whether there actually were any weapons of mass destruction in the weeks and months ahead of the invasion.

VOA: standard.2010.01.02