The study of economics is ultimately the study of human behavior and its consequences.

The world is a book, and those who do not travel read only one page.

Language is the only homeland we truly possess.

解释：药材的使用方法有做成丸剂的，有做成散剂的，有水煮的，有用酒浸泡的，说明了药材使用的多样性。

Each generation takes the earth as trustees.