The more difficult a child's life circumstances, the more important it is for that child to find joy in his or her classroom.

一个孩子的生活环境越是困难，他或她在课堂上能够找到快乐就越重要。

youdao

13 is a difficult age.

13岁是个容易出问题的年龄。

《牛津词典》

The more difficult a program is to understand, the more it will cost to maintain or implement changes to it in the future.

一个程序理解起来越困难，那么未来维护它，或者对其进行更改就越困难。

youdao

As difficult and painful as holding a hot potato.

VOA: special.2009.12.06

We can never just have it there before us or, as I say, if we can--if we can--it's a very, very difficult act of concentration.

我们永远不能只面对着它，或者，要我来说，如果我们可以的话，那将需要高度集中注意力，这是很难的。

耶鲁公开课 - 文学理论导论课程节选

and she's now playing some pretty fairly difficult things considering that she has only taken for a couple of years. So,

尽管她才学了几年，她现在已经可以弹奏比较难的曲目了。所以，

和钢琴老师 - SpeakingMax英语口语达人

The more difficult a brand is to find, the more likely it is to be substituted.

FORBES: The Wallet Allocation Rule and Your Brand

Garib also acknowledged how difficult a task the Egyptians had in winning yet another African title.

BBC: Ghana 0-1 Egypt

Seven years after graduation, I understand how difficult a college marriage, the kind Patton suggests, could be.

CNN: There's more to Princeton than marriage, alumna says