rudimentary

基本的；初步的；退化的；残遗的；未发展的英释中释adja rudimentary knowledge or understanding of a subject is very simple and basic

1 rudimentary knowledge,基础知识；初步知识

1 Gradually, I acquired a rudimentary knowledge of music..我逐渐掌握了基本的音乐知识。

2 my rudimentary German.我粗浅的德语