hard and fast rules 固定不变的 ; 固定规则
hard-and-fast rules detail 硬性规定
There are no hard and fast rules about this.
这事没有什么硬性的规定。
《牛津词典》
You can't lay down hard and fast rules.
规则不能定得太死。
There are no hard and fast rules for planning healthy meals.
在安排健康饮食方面，没有什么一定之规。
There are no hard-and-fast rules that determine if an IaaS cloud will provide savings to your business.
FORBES: ROI of the Cloud, Part 2: IaaS
Enter the Reserve Bank of New Zealand, which has become the first authority to pass hard-and-fast rules for liquidity since the crisis.
ECONOMIST: Funding rules in New Zealand
And the tricky clinical particulars of any given resuscitation mean that the paper cannot give rise to hard-and-fast rules about exactly how long doctors should persist.
ECONOMIST: Restarting hearts
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