To many students, it seems that the factual knowledge in Chemistry is easy to understand but difficult to remember, so many students are not very interested in learning factual knowledge.

但是，很多学生感觉化学事实性知识易懂难记，对化学事实性知识的学习不感兴趣。

youdao

Returning to normal life can be difficult, but some small routines—mail delivery being one of them—may help residents remember that their communities are still their communities.

回归正常生活是很困难的，但是一些日常小工作——邮件递送就是其中之一——可以帮助居民想起他们的社区仍然是他们的社区。

youdao

Formulas are easy to remember but difficult to use in working out math problems.

公式容易记，但在解决数学问题时却很难应用。

youdao

I would just say that in my experience you really have to want to do this, I would definitely encourage people to be aware of the breath and try to be mindful, but remember too it's very difficult for us to leave the negative feelings.

我只想说,根据个人经验，确实要真心想这么做，我肯定会鼓励大家,留意自己的气息，并尝试着留心察觉，但让我们抛下负面情绪,也非常困难。

普林斯顿公开课 - 人性课程节选

Eating out can be deductible but it can be difficult to remember to save and annotate receipts from restaurants (especially since receipts come in all sizes).

FORBES: Recordkeeping and Tax Time

How it affected us on a, kind of, more human and more emotional level, that's difficult to quantify, but I remember when I - in my school, we had a French teacher who was actually an English woman.

NPR: Orchestrating Goodwill for Northern Ireland

But now that his inquiry might lead to something true, Nana found it difficult to remember how she usually played the game.

NEWYORKER: Soldier��s Joy