to underlie
01
构成...的基础, 是...的根本原因
to serve as the foundation or primary cause for something
Transitive: to underlie an abstract entity
例子
Historical events underlie the national holidays of many countries.
历史事件是许多国家国定假日的基础。
02
位于...之下, 是...的基础
to be positioned below or beneath something
Transitive: to underlie a physical entity
例子
Layers of ash underlie the soil, evidence of ancient volcanic activity.
灰层位于土壤之下，是古代火山活动的证据。
