不要增加模型，除非不这样做会导致恶果，坚持爱因斯坦的观点，尽量简单地表达每个事物，但又不是过于简单。

Don't add models unless not adding them would be worse, adhering to Einstein's plea to express everything as simple as possible, but no simpler than that.

youdao

在过去，除非受邀请介入，否则联合国不参与各国的内部事务。

In the past, the UN has stayed out of the internal affairs of countries unless invited in.

《柯林斯英汉双解大词典》

除非你有医生证明，否则你不上班便拿不到工资。

You won't get paid for time off unless you have a doctor's note.

《牛津词典》

STUDENT: No. Not unless he wants to break the vase into little pieces and stuff it in the corners.

学生：【听不见】,教授：不，除非它想把花瓶打成碎片,然后把它们堆到角落里。

麻省理工公开课 - 计算机科学及编程导论课程节选

We laugh when there is incongruity between what we expect and what we actually--what actually happens unless the outcome is frightening."

当我们的期望和现实发生的事实,之间出现不一致时，我们就会笑,除非这种不一致引起恐惧”

耶鲁公开课 - 心理学导论课程节选

Unless you tell them what to do they're not gonna know how to do it.

除非你告诉它要做什么,它自己是不知道做什么的。

哈佛公开课 - 计算机科学课程节选