1) Usages can be quoted
通例可援
2) To quote a precedent
先例可援
3) There's a precedent to quote.
有例可援。
4) have a precedent to go by
有先例可援
5) have no precedent to go by
无先例可援
6) We have a precedent to go by.
我们有先例可援。
补充资料：通例
1.常规;惯例。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
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