An underlying or implied tendency or meaning; an undercurrent.
含意；暗流；内在性质隐含的或含蓄的倾向或意义；潜在势力
The fundamental principle or underlying concept of a system or theory; a basis.
基本成份一个系统或理论的基本要素或基本概念；基础
The mass of rock underlying a mineral deposit in a mine.
矿藏底石位于一个矿中金属矿藏之下的大量石头
