A wise man said: before you speak， let your words pass through three gates. At the first gate， ask yourself， "Is it true？" At the second gate， ask "Is it necessary？" At the third gate， ask， "Is it kind？"

解释：每种药材的生长都有其特定的环境和条件，说明药材产地与品质的关系。

艺术的目的是通过帮助我们更清晰地看待世界，使世界变得更美好。