a.

1. 基础的，基本的；初步的[（+to）]
   These poor people lack the basic necessities of life.

   这些穷人缺乏生活的基本必需品。

   The basic theme of these stories never varies.

   这些故事的基本主题永远不变。

2. 起点的，不包括附加部分的[B]
3. 【口】起码的，低标准的[F]
4. 【化】碱（性）的

n.[theP]

1. 基础
2. 基本原理；基本原则

adj.

1. forming an essential foundation; fundamental.
2. consisting of the minimum required or offered:
   the food was good, if a bit basic.
3. Chemistry  containing or having the properties of a base; alkaline.
   ▸Geology  relatively poor in silica:

   basic lava.
   ▸Metallurgy  relating to or denoting steel-making processes involving lime-rich materials:

   basic slag.

n.

1. the essential facts or principles of a subject or skill.
2. essential food or materials.