笔者选取《三国志》裴松之注入手研究此书，分四章论述之。
前言部分主要是提出研究的主要方向，同时阐述笔者选取论题的初衷。
Preamble is the proposal to examine the main direction, the author also introduces topics selected in the first place.
因此笔者选取这两个科作为研究对象，考证《本草纲目》中相关药物。
So the writer had choosed the two families as the investigative object, then having researched the correlated drugs in Compendium of Materia Medica.
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