regional metamorphic rocks

• 区域变质岩

regional metamorphic rocks的用法和样例：

例句

1. Generally speaking, the regional metamorphic rocks in this area can be divided into two groups, foliated and nonfoliated metamorphic rocks.
   总的来说，这一地区的区域变质岩可以归为两大类，一类是具面理的区域变质岩，另一类是不具而理的区域变质岩。