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What both views gloss over is that in real life there are difficult cases.

这两种观点都忽略了现实生活中的困难处境。

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Then: The fictional detective, Sherlock Holmes, is famous for using his powers of logic and reasoning to solve difficult cases.

过去：小说中，侦探夏洛克·福尔摩斯以运用逻辑推理能力破获悬案而著称于世。

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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

Doctors can collaborate on difficult cases and exchange views on drugs, clinical issues and devices.

FORBES: Could collaboration cure cancer?

Other artists, notably Wassily Kandinsky and Kasimir Malevich, the Russian pioneers of abstraction, are more difficult cases.

ECONOMIST: History of ideas

The BBC's Graham Satchell said that mediation would not be compulsory but would become standard practice, leaving courts to concentrate on the most difficult cases.

BBC: NEWS | UK | Plans for fairer parental access