It's hard to make farming pay.

种庄稼获利很不容易。

《牛津词典》

It's pretty hard to explain.

这事很难解释清楚。

《牛津词典》

I find that hard to believe.

我对此感到难以相信。

《牛津词典》

This might be hard to do when the teacher is writing on a board at the front of the classroom.

VOA: special.2009.09.06

PROFESSOR BAWENDI: The only But it's hard to imagine an irreversible compression the way we can just imagine an irreversible expansion.

,但是我们很难,像描述不可逆膨胀一样,来描述不可逆压缩。

麻省理工公开课 - 热力学与动力学课程节选

This decision is also hard to make because when you are a backend technology provider, it's like selling a piece of commodity.

之所以这是一个困难的决定还因为,当作为后台技术提供商时，就像出售一件商品似的。

斯坦福公开课 - 百度CEO李彦宏演讲：全球最大搜索引擎的发展课程节选

It is hard to understate the consequences of Mr Rove being distracted from his job.

ECONOMIST: George Bush and his main adviser are in a pickle

Aside from the mechanics, the products are hard to find and cost more than male condoms.

CNN: Female condoms range from 'strange' to 'natural'

Sometimes it was hard to believe that we would ever get things moving again.

UNESCO: UK National Commission for UNESCO - Stars in their mines: Cornwall mining community makes it big in Hollywood