hard and fast rule精确的标准;不容变更的原则;硬性的规定
hard and fast ashore牢固搁浅
hard and fast neaped搁浅的
hard and fast rules固定不变的;固定规则
hard and fast conclusions不容改变的结论
Launch hard and ramp fast奋力推进
a hard and fast rule划一不二的规定
hard-and-fast明确易懂;不可违逆的;明确的;不可改变的
hard-and-fast rule硬性规定;严格的规则;固定规则
ADJ（形容词） If you say that there are no hard and fast rules, or that there is no hard and fast information about something, you are indicating that there are no fixed or definite rules or facts. (规则)不容改变的; (信息)明确的 [usu with brd-neg, usu ADJ n]
There are no hard and fast rules, but rather traditional guidelines as to who pays for what.
关于谁来支付什么费用并没有一定要遵守的规定，只有传统的准则。