英语语法分析

The paper studies the microstructures of the cokeite and the high, middle metamorphic coal, formed by the metamorphism of magma in view of the need for producing moulding coal and coke.

本文从生产型煤和型焦的需要出发，研究岩浆变质作用所形成的天然焦炭和高、中变质煤的显微结构。