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Doctors, dressed up in one professional costume or another, have been in busy practice since the earliest records of every culture on earth. It is hard to think of a more dependable or enduring occupation, harder still to imagine any future events leading to its extinction.

医生们，穿着这样或那样的专业服装，从地球上每种文化最早的记录开始就一直忙碌着。很难想出一个更可靠、更持久的职业，更难以想象未来会有什么事件导致它的灭亡。

— Lewis Thomas 路易斯·汤马斯