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hard and fast 英 [hɑrd ænd fɑ:st] 　美 [hɑː(r)d ənd fæst]

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hard and fast

phrase. 严格的；固定不变的　

I do think that now you want to hit it hard and fast.　我绝对相信现在出版商想要做的就是快速推出新书。

That country now has a hard and fast rule against a teacher taking money to raise a student's grade.　那个国家现在有一个严格的规定，禁止老师接受钱来提高一个学生的分数。

1. I do think that now you want to hit it hard and fast.

我绝对相信现在出版商想要做的就是快速推出新书。
2. That country now has a hard and fast rule against a teacher taking money to raise a student's grade.

那个国家现在有一个严格的规定，禁止老师接受钱来提高一个学生的分数。
3. There are no hard and fast rules for which approach you take and when; each approach has advantages at different times within your portal lifecycle.

对于所采用的方法和何时采用这些方法没有严格的规定；在门户生命周期中，每种方法在不同时间都有优点。

See hardˌhard and ˈfast

(especially after a negative尤用于否定词后)that cannot be changed in any circumstances板上钉钉；不容更改There areno hard and fast rulesabout this.这事没有什么硬性的规定。