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Purity of heart is to will one thing.

創(chuàng)新不是目的，解決真實(shí)問(wèn)題才是。

Perhaps as important is the relation between the existence of solutions to a competitive equilibrium and the problems of normative or welfare economics.

君子能夠駕馭外物，小人則被外物所驅(qū)使。