【格言】An expert is a person who has made all the mistakes that can be made in a very narrow field.  posted on 2017/01/01 (  1101 )

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An expert is a person who has made all the mistakes that can be made in a very narrow field.

An expert is a person who has made all the mistakes that can be made in a very narrow field.

-- Niels Bohr, ذاكرة الجسد