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1·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》

2·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》

3·Why would anyone make their work more difficult than it already is?

工作已经很难了，为什么有人会让自己的工作比现在更困难呢？

4·Poverty rose and that is a factor that makes our job more difficult.

贫困问题加剧是使我们的工作变得更加困难的一个因素。

5·It is a goal more difficult than excellence in arithmetic or soccer.

这个目标，比学好数学或踢好足球更难。

6·Carrying more than a light load on your bicycle makes it more difficult to control.

自行车上携带超额负载会使自行车更难以控制。

7·While the top of the ocean is well studied, its depths are more difficult to explore.

虽然人们对海洋的上层进行了深入研究，但对海洋深处的探索却比较困难。

8·The decisions made it more difficult for states to collect sales tax on certain online purchases.

这些决定加大了各州对某些网购商品征收销售税的难度。

9·Some immigrant advocates worry that hard financial times make it more difficult for natives to keep jobs.

一些移民拥护者担心，经济困难会令当地人很难保住工作。

10·Thus, fever would make it more difficult for an infecting bacterium to acquire iron and thus to multiply.

因此，发烧会使感染细菌更难获得铁，从而更难繁殖。