closed mine的用法和樣例：
例句
- Waste water, waste gas and solid waste caused by the mine and so on.
因此國家需要建立多元的礦山環(huán)境保護投資機制。 - So he and the boys walked for more than a week, crossed the Senegal border and arrived at another mine in Mali.
所以，他和其他孩子一起走了一個(gè)多星期，穿過(guò)塞納加爾邊境，到了馬里北部的礦山。
