1) Redoubled caution became necessary.
必须格外谨慎。
2) It is necessary for you to guard your tongue.
你说话必须谨慎。
3) He that sups with the devil must have a long spoon
与坏人交往必须谨慎
4) You must show more discretion in choosing your friends.
你择友须更谨慎。
5) In prosperity caution, in adversity patience .
得意须谨慎;逆境须忍耐。
6) The nicety of a diplomatic exchange.
外交往来的谨慎
补充资料：必须
①表示事理上和情理上的必要；一定要：学习～刻苦钻研。②加强命令语气：明天你～来。‖‘必须’的否定是‘无须’、‘不须’或‘不必’。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条