a hard-and-fast rule的意思|示意

But that is not a hard-and-fast rule, Reynolds said, and an ownership stake below 10 percent is not automatically shielded from review.

雷诺说，但这也不是不可违背的惯例。拥有10%一下的股份不会自动躲过调查。

With "I don't, " on the other hand, "there's no room for debate. It's a hard-and-fast rule that you set for yourself.

而另一方面，‘不会’则说明没有讨价还价的余地，这是你给自己设定的硬性规定。

At our house there's a hard and fast rule against us kids hanging out downtown late at night. We all have to be home by ten o 'clock.

我们家有一条不可动摇的规则。我们这些孩子晚上在市区和朋友一起玩，都得在晚上十点以前回到家里。

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。

There isn't a hard and fast number that has been documented because it can vary with the type of workload, but as a rule of thumb, having more than 1 GB does not appear to be worthwhile.

但不存在一个确凿通用的数据，因为缓冲池的最佳大小随不同的负载类型变化，但根据经验，当缓冲池大于 1 GB 时往往不是什么好事。

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。