清末著名学者王国维在《人间词话》中论治学经验,他说:“古今之成大事业、大学问者,必经过三种之境界。‘昨夜西风凋碧树,独上高楼,望尽天涯路’,此第一境也;‘衣带渐宽终不悔,为伊消得人憔悴’,此第二境也;‘众里寻他千百度,蓦然回首,那人却在灯火阑珊处’,此第三境也”。后人归之为知、 Wang Guowei, a famous scholar in the late Qing dynasty, talked about the experience of studying science in The Human World Ci-poem. He said: “From ancient and modern times, we must go through three realms.” Last night, End of the World Road ’, this first Habitat also;’ belt gradually widening regret, for the Iraqi consumer haggard ’, this second Habitat;’ look for him thousands of Baidu, suddenly look back, that person is in the dim light ’, This third environment also ". Descendants of knowledge,