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

While I felt guilty for wanting something different to the norm, I knew that returning to the world of writing and travelling was the right choice, and I began planning my next move straight away.

BBC: How I quit my job to travel: The blogger

In terms of how that has unfolded, I think the pace and direction is entirely within the norm, and I refer you to HHS for more details.

WHITEHOUSE: Press Briefing

Because I think the no-haggling norm is good for society, I think firms that defect from it deserve to be stigmatized.

FORBES: Haggling, Social Norms, and Economic Efficiency