ock mass structures的用法和樣例：
例句
- Deep beams and denser columns are basic forms of frame-tube structures.
框筒結構的基本形式是由密布的外圍寬柱和深群梁組成的筒體結構。 - The geometrically combined relation of the syncline stucture with the pit controls the mechanical effect of the stuctural plane and rock mass structure.
向斜構造與采場的幾何組合關係控制著結構面和岩體結構的力學效應。
