把炉火开小一些，不然就烧焦了。

Turn the heat down or it'll burn.

《牛津词典》

你得快点，不然就迟到了。

You'd better look sharp or you'll be late.

《牛津词典》

开门！不然就砸门了！

Open up or we'll break the door down!

《牛津词典》

And so the thing to do, unless you have something else, you would go for your sword.

怎么办呢,除非你有别的东西可以当做武器,不然就只能拔剑战斗了

耶鲁公开课 - 古希腊历史简介课程节选

I think salad needs to have a lot of dressing on it to give it any kind of taste, otherwise it's too bland.

我觉得沙拉上面应该有很多沙拉酱，来丰富它的口味。不然的话，就淡而无味了。

Would you please 实战 - SpeakingMax英语口语达人

So I'm going to forget remember, so you're going to have to help me out a bit.

不然我就忘了,大家一起来帮我回忆一下

耶鲁公开课 - 博弈论课程节选