英语语法分析

Biotite is a subordinate constituent of the mafic and ultramafic rocks generally.

黑云母一般是镁铁质及超镁铁质岩石中的次要成分。

The studying degree of the predecessor is low to the Permian mafic-ultramafic rock.

前人对该地区二叠纪镁铁质—超镁铁质岩石的研究程度较低。

Alkali mafic subvolcanic body occurring in Bijiashan-Tongdongwan consists of clastic rock and lava.

笔-铜碱性镁铁质火山岩体由碎屑岩和熔岩组成。