basic

n. 基本,要素
a. 基本的,碱性的
[计] BASIC语言, 基本高级语言

These requirements are absolutely basic to a good relationship.

这些条件是良好的关系必不可少的。

A knowledge of her upbringing is basic to an understanding of her books.

知道她成长的背景是理解她著作的基础。