名詞 rudiments:

1. a statement of fundamental facts or principles
   同義詞：basics

名詞 rudiment:

1. the elementary stages of any subject (usually plural)
   同義詞：rudiment, first rudiment, first principle, alphabet, ABC, ABC's, ABCs
2. the remains of a body part that was functional at an earlier stage of life
   同義詞：rudiment

1. I have mastered the rudiments of economics.
   我已精通經濟學的基本原理。