When using sorbitic extractors, try to teach and explain packing method.

在使用沙氏提取器时，应作试教，讲解安装方法。

The paper deals with the microstructrures and hight-temperatrure hardness of highchromium white cast iron with the austenitic and sorbitic matrices.

主论奥氏体及索氏体为基体的高铬白口铁的组织和高温硬度。