type of metamorphism

例句：

1. 1.The type of metamorphism in the area is unique to this region.
   该地区的变质岩类型是独一无二的。
2. 2. The study of metamorphism helps us understand the geological history of the Earth.
   研究变质作用有助于我们了解地球的地质历史。
3. 3. Metamorphism can occur during the formation of rocks, changing their chemical and physical properties.
   在岩石形成过程中，变质作用可以发生，改变其化学和物理性质。