geologic structure. 基本例句 地质构造 The density of sedimentary rock varies with depth. Density variation must be considered in researching sedimentary basin and its internal geologic structure with the use of gravimetric data. 沉积岩的密度是随深度而变化的，用重力资料研究盆地及其内部构造时必须考虑变密度的情况。 chemyq