You don't need to, if you want to take advantage then you can, but you don't need to.

你不一定要这样做,除非你想充分利用该网站,不然的话,真的没必要

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

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

At least you maybe finding that and if not when you look back at the code you then have written you'll realize that in fact it just requires a few lines of code.

至少你会发现这一点，不然的话，在你写完代码，返回去,看的时候你会意识到,实际上它只需要几行代码。

哈佛公开课 - 计算机科学课程节选

So, most states would essentially adopt what the NAIC says, otherwise--they're not going to figure it all-- they can't claim to beat--it would be rational to do that.

因此大部分州基本上都会采纳这些建议,不然的话,各州要自己进行全盘考虑,若要推翻保协会的建议,那将是不理智的

耶鲁公开课 - 金融市场课程节选

So in sections where you have the opportunity to work in smaller environments with one of the teaching fellows, in office hours we have an opportunity to work one on one, hands-on in the computer lab or else we're on campus and really get personalized attention when it comes to diving into these problems.

因此在分组后,你们有机会与教员们一起在小房间里工作，在上机时间内我们有机会一对一授课，在实验室内亲身实践,不然的话我们在校园里探讨问题,会被很多人围观的。

哈佛公开课 - 计算机科学课程节选