英语语法分析

Touramaline has many varieties in the nature, and a majority of powder of them is black or cinerous, so their application in the fields where need colour requirements is affected.

自然界产出的电气石品种很多，大部分粉末是黑色或灰色的，在一些需要色泽要求的领域应用受到较大的影响。