惯例的英文：
conventional

It upsets the groove.
这扰乱了惯例。

I'm afraid it goes against the usual commercial practice not to allow a commission.
不给佣金恐怕有悖于商业惯例吧。

Advice on Mexican laws regarding taxes and on Mexican accounting practices
就墨西哥税法和财会惯例给予咨询

He backed slowly away from insisting on strict observance of the customs.
他渐渐不再坚持要严格遵守这些惯例了。

Individual convictions count for little when habits of corruption or the drive for the quick buck overwhelm them.
当腐败惯例或者获取短期利益的欲望战胜个人信念的时候,个人信念没有什么作用。

She went through her usual ritual of making sure all the doors were locked before she went to bed.
她上床之前按惯例检查一下所有的门是不是都锁上了。

CPM(Cost per Thousand Impressions)
网上广告产生每1000个广告印象（显示）数的费用。按访问人次收费已经成为网络广告的惯例。目前国际上每个CPM收费从￥20到￥80不等。

custom of foreign trade.
对外贸易惯例

A juridical precedent is nothing but "authenticated custom"
司法惯例只不过是“权威的惯例”罢了。

The traditional handshake
惯例性的握手

conventional community
契约上的财产共有，约定财产共有

Convention on Succession and Administration of Estates
遗产继承和管理公约

By convention, you should follow this guideline.
所以习惯上你应该遵守这个指导原则。

The convention is scheduled for the fall.
大会定在秋季召开。

Old conventions die hard.
旧的习惯势力是不会轻易消亡的。