英语语法分析

In petrographic terms, this stone is defined as volcanic tufa.

地质学上，此石材属于火山凝灰岩。

The chemical composition, petrographic analysis and dispersing property of kinds of bauxitic clay are compared.

对比研究了几种铝矾土的化学组成、相组成和分散性能。

The results show that coals combustion characteristics have a linear dependence relation with the petrographic factor.

研究表明：煤的燃烧特性与岩相因子有很好的线性相关性。