"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？”
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。
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。
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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