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1·But that's not a hard and fast rule.

但这并不是硬性规定。

2·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。

3·Our factory has a hard and fast rule against smoking.

我们工厂严格规定不许吸烟。

4·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。

5·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。

6·There is no hard and fast rule about the use of the terms dermatitis and eczema.

关于皮炎和湿疹两词的应用并无固定(严格)的规则。

7·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。

8·There is no hard and fast rule on how a life handbook should be; it is up to your preference.

人生指南手册应该怎么样，这个没有硬性规定；它取决于你的喜好。

9·At our house there's a hard and fast rule against us kids hanging out downtown late at night.

对于我们这些孩子们晚上在市区里和朋友一起玩，我们家有一条不可动摇的规则。

10·It's not a hard and fast rule but I find pixel drawings look best when they have black Outlines.

这不是一个硬性的规则，但我觉得最好看的像素图时，有黑色的轮廓。