学海无涯,生命有限。穷年累月,弄通一门学问已属不易;超越前人,有所创获,更需勤奋。许多事情不可能坐在书斋内解决,而实地考察,也不是每个人都可以办到的事。(《读郑道昭碑刻五记》)不同作者的画,同一作者不同时期的作品,加以比较,都有高低之分。这种差异,有时显而易见,有时较难判断。而华美、素美、壮美也只是大体上的分野,一个人无 Learning sea knows no limit, life is limited. Year after year, get through a knowledge already is not easy; Beyond predecessors, some of the achievements, more need to be diligent. Many things can not be settled in the study room, and field trips are not something that everyone can do. (“Five Readings of the Inscriptions of Zheng Daozhao”) by different authors, and the works of different authors of the same author are compared to the same extent. This difference is sometimes obvious and sometimes difficult to judge. The gorgeous, beautiful, magnificent beauty is only a general distinction, a person without