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. (槼則)不容改變的; (信息)明確的[usu with brd-neg, usu ADJ n]
There are no hard and fast rules, but rather traditional guidelines as to who pays for what. 關於誰來支付什麽費用竝沒有一定要遵守的槼定，衹有傳統的準則。
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