“煤矿”造句

煤矿中天然存有高爆气体。
Highly explosive gas is naturally found in coal mines.

许多人到煤矿来,是因为契约规定必须服务几年.
Many people came to the coal mineindentured for several years.

煤矿工人须在地下工作.
Coal miners have to work under the ground.