成例

zhè shì méi yǒu chéng lì kě yuán

这事没有成例可援。

There is no precedent for this.

dǎ pò chéng lì

打破成例

break with precedent

méi yǒu chéng lì kě xún

没有成例可循

have no precedent to go by

tā bù yuàn mó fǎng yǐ yǒu de chéng lì

他不愿模仿已有的成例。

He was not prepared to follow stereotypes.

yuán yǐn chéng lì

援引成例

cite a precedent

sōu jí chéng lì duì gāi xiàng yán jiū yǒu hěn zhòng yào de yì yì

搜集成例对该项研究有很重要的意义。

The study collected precedents and practices of the very important significance.