Our factory has a hard and fast rule against smoking.

我们工厂严格规定不许吸烟.

《简明英汉词典》

There's no hard - and - fast rule.

并无定规.

《现代汉英综合大词典》

We must make it a hard and fast rule against smoking in the office.

我们必须严格规定:办公室里不准吸烟.

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The teacher said that there was a hard - and - fast rule against smoking in school.

教师说学校有严格的禁止吸烟的规定.

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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.

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