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1·Whenever they reached their goal, they upped the ante, setting increasingly complex challenges for themselves.

每当他们达到了目标，他们就加高要求，为他们自己设置越来越复杂的挑战。《柯林斯英汉双解大词典》

2·This raises unique challenges for Arctic wildlife and indigenous people who depend on Arctic ecosystems to survive.

这对依赖北极生态系统生存的北极野生动物和土著居民提出了独特的挑战。

3·This could fix the main organisational challenges for the university, but not for the learners, due to lack of time, family obligations or funds.

这对于大学来讲可能解决了组织上面临的主要挑战，但对于学习者而言，由于缺乏时间、家庭义务或资金，挑战仍然存在。

4·Most of all, though, I wish a tenth of the energy that's spent endlessly debating GM crops was focused on those more pressing challenges for global agriculture.

然而，最重要的是，我希望把花费在无休止争论转基因作物上的十分之一的精力集中到全球农业面临的更紧迫的挑战上。

5·Pilot Rock offers challenges for those from beginners to advanced climbers!

“Pilot Rock”攀岩馆对初学者到高级攀岩者都提供了挑战！

6·Opening a book or raising hands, some very easy actions for common people, however, are big challenges for Xu.

翻开一本书或举手，这些对于普通人来说很简单的动作，但对徐来说却是些巨大的挑战。

7·TCM's complexity and underlying conceptual foundations present challenges for researchers seeking evidence on how it works.

中医药的复杂性和深层的概念基础，给研究人员寻找其工作原理的证据带来了挑战。

8·Lengthy delays like this are one of the key challenges for NASA, according to an April 2011 report from the US National Academy of Sciences.

美国国家科学院于2011年4月的报告称，这样的长时间延误是美国航空航天局面临的主要挑战之一。

9·Big Web sites pose some new challenges for SEO.

大型Web站点对SEO提出了一些新挑战。

10·NO CHECKLIST OF MINIMALIST CHALLENGES FOR ME!

没有极简主义的清单对我是一个挑战。