He is one of many who have flocked to the Kangari hills in southern Sierra Leone to find small fortunes in the hard graft of alluvial gold mining.

VOA: standard.2010.04.22

And the fact of being asked to do ten positive features is people find this hard.

实际上大家都会发现,要列举出某人的十个优点,是相当困难的。

耶鲁公开课 - 心理学导论课程节选

This is necessary, it's hard to find holes in a Nobel Prize worthy idea.

这是很必要的，在一个获得诺贝尔的想法中,很难发现漏洞。

麻省理工公开课 - 化学原理课程节选

Some place in the middle is where the truth is, and it's hard to find.

事实往往在两种极端的中间,想找到它并不容易

耶鲁公开课 - 古希腊历史简介课程节选

Why is it so hard to find stem cells?

为什么寻找干细胞要如此大费周章呢

耶鲁公开课 - 生物医学工程探索课程节选