have certain rules
有一定的规则
以上为机器翻译结果，长、整句建议使用 人工翻译 。
You have to write certain rules that are based on how you are modeling the data.
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Gentlemen, your campaigns have agreed to certain rules, and they are simple.
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However they often have complicate rules, with certain days of the week or times of day when they do not welcome guests.
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