It wasn't in the rules, but it was tradition.
规则里没有这条，但这是传统。
He believe it necessary to learn some rules before doing it.
他认为有必要先掌握一些规则，然后再干。
There are three rules for studying English, to use it, use it and use it.
学好英语口语有三种途径，运用，运用，再运用。
There are three rules for studying English, to use it, use it and use it.
学好英语口语有三种途径，运用，运用，再运用。
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