1) He that sups with the devil must have a long spoon
与坏人交往必须谨慎
2) Redoubled caution became necessary.
必须格外谨慎。
3) It is necessary for you to guard your tongue.
你说话必须谨慎。
4) The nicety of a diplomatic exchange.
外交往来的谨慎
5) prudent man
谨慎人
1.
The prudent investment rule of trustees in America has developed from the legal list stage to prudent man rule and now the prudent investor rule.
美国信托受托人谨慎投资义务规则经历了从法定清单制度、谨慎人规则到谨慎投资人规则的历史过程。
6) You must show more discretion in choosing your friends.
你择友须更谨慎。
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