In fact, there are no fixed rules to how partial reps can be done.

事实上，没有明确的规则可以界定半程动作。

Some fixed rules about the company he or she keeps must be observed.

必须遵守关于他或她所保持的公司的一些固定规则。

There are many more imaginative ways to write essays; this is not a fixed rule.

有很多更有想象力的写论文的方法；这不是一个固定的规则。

It teaches us, I believe, a lesson of great value-that even the fixed rules of our community are only moderately fixed.

我相信，它教会了我们一个很有价值的教训——即使是我们社区的固定规则也只是适度固定的。