pencil lead method

• 钻芯法

pencil lead method的用法和样例：

例句

1. This paper gives a descrip tion of the use of core method and outburst omen method to predict outburst hazard in airshaft of Haishi wan Coal Mine.
   并介绍了海石湾矿风井岩芯法及其突出预兆法预测突出危险的试验情况。