But that may be hard to do ince primary care physicians earn much less than specialists.

VOA: standard.2010.05.14

It's sometimes hard for me, but I trust that you will be able to do that.

有时会有点困难，但我相信你们能做到。

耶鲁公开课 - 1945年后的美国小说课程节选

comes from flawed reports of what people eat, because in order to know what people eat you have to ask them, and even if people are really trying hard to be truthful, it's not the easiest thing to do.

这些信息来自于关于人们饮食缺陷的报告,因为你必须询问人们,吃了什么,尽管人们会尽量实事求是,但这很难做到

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选