bedrock

1. N-SING The bedrock of something is the principles, ideas, or facts on which it is based. 基本原理

Mutual trust is the bedrock of a relationship. 相互信任是建立关系的基础。

We believe in religious freedom as a bedrock principle of our democracy. 我们相信宗教信仰自由是我们民主的基础。

2. N-UNCOUNT Bedrock is the solid rock in the ground which supports all the soil above it. 基岩