那是要遵守的好规则。

That's a good rule to go by.

《牛津词典》

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。

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

《柯林斯英汉双解大词典》

我们学校必须遵守的规定是：没有家长的书面允许不能给孩子做测试。

One unbreakable rule in our school is that no child can be tested without written parental permission.

《柯林斯英汉双解大词典》

There is a plurality of solutions that conform to the boundary conditions, which is that the system must be bound.

这有许多解决方式,来遵守这个有界条件，那个系统必须是有界的。

麻省理工公开课 - 固态化学导论课程节选

As for a case study, I could talk about certain religious community's requirements that women practice purdah.

至于说个案，我可以谈谈,某些宗教团体的规定,要求女性遵守深闺的习俗。

普林斯顿公开课 - 人性课程节选

Separation entails also separation to God's service. That means, of course, the observance of his laws, especially the laws of purity, the rejection of pagan practices, and so on.

分离也意味着脱离上帝的侍奉，这就是说，遵守他的律法，尤其是圣洁的律法，拒绝异教习俗，等等。

耶鲁公开课 - 旧约导论课程节选