He bore the unwritten rule in mind.
他牢记那条不成文的规矩。
But I'm guessing it's sort of an unwritten rule.
但是我猜大概是条不成文的规定。
It was an unwritten rule never to disturb dad's work.
不打扰爸爸的工作是个不成文的规定。
This soon became an unwritten rule in Britain and Ireland.
这在英国及爱尔兰很快就成为一条不成文的规定。
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