Sometimes it's easier actually not touch it to the metal, -- I should have- TA: It's hard to see if it's moving or not.

有时候它更容易不接触金属，我本应该-,助教：很难看到它是否移动了。

麻省理工公开课 - 化学原理课程节选

but it's hard because I wouldn't know what to choose.

但是，这很难，因为我不知道该选什么专业。

想开精品店 - SpeakingMax英语口语达人

I think it's very difficult, indeed I think it's impossible, to think of anything you'd want to do forever.

我认为很难，其实我认为不可能，想出一件你希望永远做下去的事。

耶鲁公开课 - 死亡课程节选

"Dificil, eh?" means " Difficult, isn't it?") Alright. I have to see this one more time.

很难不笑，不是吗）,我要再看一遍。

哈佛公开课 - 幸福课课程节选

And I don't know. It really does the pain.

我也不太清楚，真的很难对比。

类似常春藤 - SpeakingMax英语口语达人