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1·You can't lay down hard and fast rules.

规则不能定得太死。《牛津词典》

2·There are no hard and fast rules about this.

这事没有什么硬性的规定。《牛津词典》

3·There are no hard and fast rules for planning healthy meals.

在安排健康饮食方面，没有什么一定之规。《牛津词典》

4·There are no hard and fast rules, but rather traditional guidelines as to who pays for what.

关于谁来支付什么费用并没有一定要遵守的规定，只有传统的准则。《柯林斯英汉双解大词典》

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

但这并不是硬性规定。

6·There are no hard and fast rules here.

本文无法提供硬性而快速的规则。

7·The question does not have a hard and fast answer.

这个问题不会有明确而直接的答案。

8·Men also tend to have a hard and fast goal in mind.

男性企业家通常会有一个坚定且需要迅速达成的目标。

9·Honestly, hard and fast guidelines are very difficult to establish.

坦白的说，一成不变的建议是非常难确立的。

10·I'll wake up with my heart beating very hard and fast, and I'll be WIDE AWAKE.

我会在剧烈和快速的心跳中醒来，然后睡意全无。

严格的

1·There's a few of hard and fast rules when it comes to not losing your bike this way.

很少有什么严格的规则能够让你不丢自行车。

2·While there is no hard and fast rule, over time, observations of increases in data will correspond to increases in utilization of DataPower resources.

虽然没有一种严格的规律，但是随着时间推移，数据的增长将对应于DataPower资源利用率的增长。