說一不二 mean what one says; he is a man of his word.; he is as good as his word.; never make a promise one cannot keep; say one and it never becomes two -- one never changes his words; stand by one's word 他是說一不二的, 答應(yīng)的事一定能辦到。 he is a man of his words, and never makes a promise he can't keep
劃一 standardized; uniform 尺寸劃一 be of uniform size; 整齊劃一 uniform; 劃一列車間隔 uniform train interval