hard and fast
柯林斯词典
1. ADJ 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。
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