I know it's possible to induce chemical reactions, but these are exceptions. This is not the norm.

我知道催化化学反应是可能的，但是那些是特例，不是常规情况。

麻省理工公开课 - 固态化学导论课程节选

It might be true that those cases do happen, but I really think they are not the norm.

虽然有这种案例，但我并不认为这是一种普遍情况。

需要动物实验吗？ - SpeakingMax英语口语达人

Not ever a human rights norm, I'm saying is absolutely right.

我并不是说哪一种人权规范，是绝对正确的。

普林斯顿公开课 - 人性课程节选

You can also get away, as I said last time, with just putting parentheses in JavaScript and PHP, this is, in fact, the norm.

就像我上次说的，你也可以不用参数，在JavaScript和PHP中只用圆括号，这实际上是一个规范。

哈佛公开课 - 计算机科学课程节选

But it's by no means the norm. It's actually, probably I'm a bit unusual like that

但是那绝对不是规范的。事实上，可能我有一点不太平常的是，

英国的影视产业 - SpeakingMax英语口语达人