这个家伙打破了男人们应该遵守的不成文规则。
这句话是商业经营的不成文规则，就是简单的百分比问题。
It is one of the unwritten laws of business, a matter of simple percentages.
更为不幸的是，作家们无法理解，译者们不能互通有无的部分是由于他们不熟悉礼物交换的不成文规则。
Even more unfortunately, writers found it difficult to understand that failure of translators to reciprocate was in part due to their unfamiliarity with the unwritten rules of gift-exchange.
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