约定俗成

The wrong use of the word is sanctioned by usage.

这词误用已约定俗成了。

Traditional identification as to the three styles in singing performance has been tostada in the development in music arts.

约定俗成“三种唱法”划分模式已越来越不利于乐业发展，它缚了人乐这门艺术艺术性和思想性认识和表现。