理由reason;ground;argument;rationale
他的～不能成立。His argument is untenable;He’s giving a lame excuse./有充分～相信have every reason to believe/没有～过于乐观have no ground for euphoria/找～为自己的错误辩解try to find an excuse for one’s error;try to explain away one’s error/没有～自满have no ground for self-complacency/说明～ give the rationale/存在的～raison d’être |