前例 precedent 史无前例 without precedent in history; unprecedented; 无前例可援 have no precedent to go by; 你要我做的事有前例可援吗? is there a precedent for what you want me to do
先例 precedent; previous case taken as example 开先例 set a precedent; create a precedent; 有先例可援 have a precedent to go by; 为...创一先例 create a precedent for ...; 历史先例 historic precedent; 不乏先例。 there is no lack of precedents in this connection. 如果允许他这样做, 就会为别人开先例。 if he is allowed to do this, it will be a precedent for others
史无前例 there was no parallel in history.; be unprecedented in the nation's history; unprecedented in history; without parallel in history; without precedent in history 史无前例的壮举 an unprecedented feat; 工农红军胜利地完成了史无前例的二万五千里长征。 the workers' and peasants' red army victoriously completed its unprecedented 25,000 li long march
史无前例的 u recedented; unprecedented; without precedent in his history; without precedent in history