A friend of mineworking there told me the other day that they were in need of some volunteer keepers.
我一个在那里工作的朋友前几天告诉我，他们需要一些志愿饲养员。
2
Based on analyzing the mineworking process of coal cutting and driving, a method of setting the rational rate of coal cutting and driving in different mines is deyeloped.
本文通过矿井采掘工作过程的分析，提出了不同类型矿井合理掘进率的确定方法。
3
According to the principle of conservation, differential equation which can describe airflow temperature distribution in state of turbulent flow in mineworking face is deduced.