You can't lay down hard and fast rules.

规则不能定得太严太死.

辞典例句

You can not lay down hard and fast rules.

你不能制定严格的规则.

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It is impossible to lay down any hard and fast rules.

想要制定出任何不容更改的规则是不可能的.

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Road and bridge area on this year's public funds management has a hard and fast rules.

路桥区对今年的公用经费管理有着硬性规定.

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