One day, while walking down a country road, Doyne saw a little girl breaking up rocks.
一天，Doyne 走在乡间小路上，看见一个小女孩正在砸石头。
2
Lead isotope research shows that lead in ores of Mujiazhuang copper deposit and near ore countryrocks is characterized by being rich in radioactive lead.
铅同位素结果研究表明，穆家庄铜矿矿石铅和近矿围岩岩石铅具有富含放射性成因铅的特点。
3
This paper introduced emphatically to mining method for the ore-body of gentle dip and medium thickness under the condition of medium or poor stableness of countryrocks in upper wall.