They have to pay--the premium has to cover the costs, so it was tough to get someone to buy life insurance even though they really needed it--it was such a good idea for them.

因为保费必须要超过保险公司的成本,因此,尽管寿险很好,人们也需要它,但是真正要说服人们购买,却是很困难的

耶鲁公开课 - 金融市场课程节选

It's tough, but if you work overnight you can do it.

这可能很困难，但你要是通宵熬夜的话，你是可以完成的。

How can I 实战 - SpeakingMax英语口语达人

I rather suspect if J. J. hadn't gotten his Nobel, it probably would have been tough for Rutherford to get one since some of these guys stood on the committees.

我认为如果J。J没有得到诺贝尔奖，那么这也会是一件很困难的事,对卢瑟福来说的话,因为他们中的一些人和委员会的是一致的。

麻省理工公开课 - 固态化学导论课程节选

It's, because sometimes it's generally tough at first,

学习语言最一开始的时候总会很困难，

想学会4种语言 - SpeakingMax英语口语达人