Only do these more difficult stretches when you are warmed up.

要做了准备活动以后再做这些较难的伸展运动。

《牛津词典》

Any experience can teach and strengthen you, but particularly the more difficult ones.

任何经历都可以让你学到东西，使你变得坚定，那些更困难的经历尤其如此。

《柯林斯英汉双解大词典》

Some people find this more difficult than others.

这件事有人觉得难，有人觉得不难。

《牛津词典》

In Washington, Julianne Brienza notes that next year it will be more difficult to get donations for Capital Fringe.

VOA: special.2009.08.05

Now the intervention studies are stronger methods than the epidemiology studies but they're also more difficult studies to do.

相比传染病学研究,干预性研究更有效,但也更难执行

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

the work doesn't seem to be that much more difficult from what's at other universities.

功课也没有比别的大学难很多。

对于赞助入学的看法 - SpeakingMax英语口语达人

This year it is even more difficult, as the hoped-for economic recovery failed to materialize.

FORBES: The Overachievers Of 2002

With HPV it is even more difficult, because cervical cancer takes years to develop.

FORBES: Cornering A Killer

The EU's enlargement has also made consensus-building more difficult, multiplying the national rivalries and tensions.

BBC: Profile: EU Commission chief Barroso