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Without unwritten rules civilized life would be impossible.
没有不成文的规章，就不会有文明生活。
《牛津词典》
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This is the industry's unwritten rules.
这是业内不成文的规矩。
youdao
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River's lake unwritten rules: people don't trash face!
江湖不成文的规矩：踩人不踩脸！
youdao
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River's lake unwritten rules: people don't trash face!
江湖不成文的规矩：踩人不踩脸！
youdao