江湖不成文的规矩：踩人不踩脸！
他牢记那条不成文的规矩。
这是业内不成文的规矩。
美国媒体一条不成文的规矩就是付费电视的费用总是不断增加。
One of the unofficial rules of American media is that pay-television bills always rise.
理论上小费给多少纯属自愿，但是在美国，不少地方都有不成文的规矩。
In therory the amount of tips is optional, but in many places of Ameica, there are some unwritten rules on tipping.
这就是为什么：硅谷文化有一个不成文的规矩，如果你不喜欢某个工作，或者你觉得公司没啥前途，你走人即可。
Here's why: Valley culture has an unwritten rule that if you don't like a job, or if you think your company isn't going anywhere, you leave.
法律没有规定他们杀人无罪，但存在于委内瑞拉贫民窑里的不成文规矩却让警员们经常可以知法犯法。
The law says they cannot kill with impunity. But in the slums of Venezuela a separate set of rules applies, which all too often allows police officers to do just that.
柬埔寨不成文的交通规矩是人要谦卑地为车辆让路，在如此多的人车拥堵在街道上，规范只有被践踏成为混乱无序。
With so many people and vehicles thronging the roads, Cambodia's informal protocol for traffic-small gives way sheepishly to large-collapses into anarchy.
柬埔寨不成文的交通规矩是人要谦卑地为车辆让路，在如此多的人车拥堵在街道上，规范只有被践踏成为混乱无序。
With so many people and vehicles thronging the roads, Cambodia's informal protocol for traffic-small gives way sheepishly to large-collapses into anarchy.
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