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That turns out to be really difficult, because so many characters can cause problems in some cases.

人们发现这确实很困难，因为在一些情况下有太多的字符可能会带来问题。

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In some particularly difficult cases, especially network-related problems, this information often plays a key role in tracking down the source.

在某些非常困难的情况下，特别是与网络相关的问题，这些信息常常在跟踪问题来源的任务中扮演重要的角色。

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Why is it difficult in some cases to produce a vaccine when we've been successful in so many others?

为什么某些疾病的疫苗很难研制,即使我们已经成功生产了很多种疫苗

耶鲁公开课 - 生物医学工程探索课程节选

We came into government in what were obviously controversial circumstances because we are governing with our sworn enemies the Conservative Party, and, even more controversially, we're having to make very, very difficult and in some cases downright unpopular decisions.

BBC: Lib Dem conference: Clegg warning over axing 50p tax

They must learn Portuguese, work in often difficult conditions and, in some cases, avoid police raids.

CNN: Booming Brazil lures immigrant workers

''Abandoned cars that are sticking out too far in the street are making snow ploughing difficult in some areas and in some cases making ploughing impossible.

BBC: Abandoned cars 'stopping snow ploughs' in Tayside