In the old days when people invented a new function they had something useful in mind.
在过去，当人们发明了一种新功能时，他们的头脑中有一些有用的东西。
-- Henri Poincare 彭卡勒
In the old days when people invented a new function they had something useful in mind.
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In the old days when people invented a new function they had something useful in mind.
在过去，当人们发明了一种新功能时，他们的头脑中有一些有用的东西。
-- Henri Poincare 彭卡勒
