But that's not a hard and fast rule.
但这并不是硬性规定。
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。
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 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。
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。
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。
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。
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