1. 基础；基本内容；基本原则
The basics of something are its simplest, most important elements, ideas, or principles, in contrast to more complicated or detailed ones.

2. 必需品；基本需求
Basics are things such as simple food, clothes, or equipment that people need in order to live or to deal with a particular situation.

3. 注重基础；回到根本
If you talk about getting back to basics, you are suggesting that people have become too concerned with complicated details or new theories, and that they should concentrate on simple, important ideas or activities.

1. principles from which other truths can be derived

e.g. first you must learn the fundamentals
let's get down to basics

Synonym: fundamentalsfundamental principlebasic principlebedrock

2. a statement of fundamental facts or principles

Synonym: rudiments