solid unweathered rock lying beneath surface deposits of soil
principles from which other truths can be derived
双语例句
Samdwich rock slope is a kind of common slopes in the hydroelectric project, which have complicated project nature, influence the life security of people. 层状岩质边坡是水利水电工程中常见的一种边坡,具有复杂的地质条件和工程特性,影响着施工人员的生命安全。