n.[C]

1. 基础，基本原理；初步，入门[the P][（+of）]
   It didn't take me long to pick up the rudiments of the language.

   我没有费多少时间就学会了这一语言的初步知识。

2. 雏形，萌芽[the P][（+of）]
3. 发育未全的器官；退化器官[C]

n.

1. (rudiments) the first principles of a subject.
   ▸an elementary or primitive form of something.
2. Biology  an undeveloped or immature part or organ.
3. Music  a basic pattern used by drummers, such as the roll, the flam, and the paradiddle.