人分这么几种:不认识,认识,熟人,朋友,知心朋友。朋友不在当面表白,而是背后说起朋友的时候,是否提到过你。
Innovation in science often comes from looking at old problems in new ways.
别让任何人黯淡你的光芒。
True understanding comes from grasping the inner structural relationships of a problem.