But that's not a hard and fast rule.
但这并不是硬性规定。
Our factory has a hard and fast rule against smoking.
我们工厂严格规定不许吸烟。
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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