【“潜规则”或“不成文的规定”在英语口语里我们一般说】Unwritten rule或Unspoken rule, 举俩栗子:1. You do not tell a girl she's fat, even if she is. It39;s kinda an unspoken rule. 2. Hey, you can't sleep with your friend39;s EX! --Why? Is that some sort of unwritten rule?