host rock

例句：

1. 1.The host rock is a crucial part of the geological formation.
   主机岩石是地质构造中至关重要的一部分。
2. 2. The host rock has been extensively studied for its mineral composition.
   该主机岩石因其矿物组成而广泛研究。
3. 3.The host rock was formed millions of years ago during the early Earth's crust formation.
   该主机岩石在数百万年前，地球早期地壳形成时形成。