subordinate species是什么意思

用法例句

In this paper, the mode of occurrence of minor elements in coal, which have atight relation to their pollution characteristics, have been reviewed.

对煤中次要元素的赋存方式进行了分析，讨论了元素赋存方式的研究方法，指出采用草取方法和沉／浮方法结合将更有益于确定煤中次要元素的赋存方式。