humus acid

• 黑色腐殖酸

humus acid的用法和样例：

例句

1. This paper describes the principles and methods of extracting humic acid product from lignite.
   摘要论述了褐煤中提取腐殖酸产品的方法及原理。
2. Humus was added into nonorganic silt to clarify the effect of a variety of additives on the cemented soil performance.
   在去除有机质的黏质粉土中加入腐殖酸，研究了经某种液态添加剂改良后的水泥土特性。