wandering coal

例句：

1. 1.The mine was filled with wandering coal miners, who were searching for new sources of income.
   矿井里充满了寻找新收入来源的游荡的煤炭矿工。
2. 2.The wandering coal miners had to work long hours to earn a living.
   游荡的煤炭矿工不得不长时间工作以谋生。
3. 3.The wandering coal miners were facing many challenges as they tried to find new ways to extract the coal.
   游荡的煤炭矿工在尝试找到新的提取煤炭的方法时面临着许多挑战。