你要么是个纯粹的天才，要不然你准是完全疯了。

You are either a total genius or else you must be totally crazy.

《柯林斯英汉双解大词典》

慢一点，要不然你又要被开罚单了！

Slow down or you'll get another ticket!

youdao

抓住机会，要不然你会后悔的。

Seize the chance, otherwise you will regret it.

youdao

but you gotta be willing and able to be decisive, you know, when you are not, the patients not gonna make it if you just stand there.

但你必须主动,而果断，要不然仅仅，袖手旁观,病人是无法痊愈的。

普林斯顿公开课 - 领导能力简介课程节选