英语语法分析

In the immense and vast global biosphere, there exists a kind of noteless melanocratic organic matter which is humic substances.

在浩瀚广袤的地球生物圈里，蕴藏着一种不引人注目的暗色有机物，这就是腐植酸类物质。

Humic substances are known to coat membrane filters.

腐殖质是已知能够覆盖滤膜的物质。

Coal rock can be classified as humic and sapropelic coal.

在煤岩的分类中，有腐殖煤和腐泥煤之分。