Beginning his research with the problem, "What are the differences between the ginseng described in the Compendium of Materia Medica 500 years ago and the ginseng we use today," he found that this world of "herb roots and tree bark" is one of vast learning.
從「五百年前《本草綱目》上的人參，和現存的人參有哪些差異？」開始研究起，才窺知這一片「草根樹皮」的世界，學問大矣。