"What was your most difficult case?" one asked the other.

其中一个问另一个：“你最棘手的病例是什么样的？”

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Most of us associate learning as something difficult, something reserved for extremely intelligent people, but that is not the case at all.

我们大多数人认为学习是很困难的事，学习只属于那些十分聪明的人，但事实绝非如此。

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Petroleum industry is a complex system full of technicality, the case it faces is layer kilometers deep. In most cases, quantitative analysis and accurate description is very difficult.

石油工业是一个技术性强的复杂系统，所面对的现实对象是地下数千公尺深的地层，在多数情况下无法定量、准确地对其进行真实描述。

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Mr Rato played an important role as an intermediary in the IMF's most difficult case of the past few years: the default of Argentina in 2001.

BBC: NEWS | Business | Rato confirmed in IMF's top job

Without much doubt, the 1999 Boston indictment would have been the most difficult, complex and expensive case for Bulger to defend against.

FORBES: Black and Whitey: How the Feds Disable Criminal Defense

Before I move to an overview of the articles and the response you'll hear over the next couple of days, I want to suggest to you an approach to one of the most difficult questions that you face: How does one sitting in judgment on a case like this assess the reliability of what he or she hears and sees?

CNN: Transcript: White House Counsel Ruff's opening statement