crude boron stone

• 硼矿石

crude boron stone的用法和样例：

例句

1. However,in order to enhance boron trioxide activity,boron ore must be calcined when alkali method is applied to process it.
   而碱法加工硼矿石时，必须对硼矿石进行焙烧，以提高三氧化二硼的活性。