形容词

1. 基本的;简陋的;不完善的
Rudimentary things are very basic or simple and are therefore unsatisfactory.

2. (知识)基本的，初步的，粗浅的
Rudimentary knowledge includes only the simplest and most basic facts.

1. being in the earliest stages of development

e.g. rudimentary plans

2. not fully developed in mature animals

e.g. rudimentary wings

Synonym: vestigial

3. being or involving basic facts or principles

e.g. the fundamental laws of the universe
a fundamental incomatibility between them
these rudimentary truths
underlying principles

Synonym: fundamentalunderlying