There is no hard and fast rule here, and every application will differ somewhat.
这里没有一尘不变的规则，所有的应用程序都会有点不同。
But that's not a hard and fast rule.
但这并不是硬性规定。
This is not a hard and fast rule, it is simply what I recommend from experience.
这不是一个硬性的规则，它只是我所建议的经验。
There is no hard and fast rule on how to deal with this type of emergency.
对于如何处理这种紧急情况，尚无严格规章。
Our factory has a hard and fast rule against smoking.
我们工厂严格规定不许吸烟。
There is no hard and fast rule about dilution.
妈妈对家中什么是急需有严格的规定。
There is no hard and fast rule about dilution.
妈妈对家中什么是急需有严格的规定。
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