I see

來源: Euro-dollar 於 2018-11-08 06:57:28 [] [舊帖] [給我悄悄話] 本文已被閱讀： 次 (320 bytes)

Li Lun li xue is basically Newtonian dynamics. So I only know one of the four. 

I don't think I will be able to invest a lot of time on all of them, or I don't think that I will be a physicist.

However, knowing some basic things is important to avoid be cheated. 

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