bedrock

基礎、根基、基石

Mutual trust is the bedrock of any lasting partnership.

互信是任何長久合作關係的基石。

基岩、岩盤地質

Workers drilled through the soil until they reached bedrock.

工人一路鑽過土層，直到觸及基岩。

根本的、最基本的限定用法

Free speech remains a bedrock principle of the constitution.

言論自由仍是憲法最根本的原則。