dia mine

例句：

1. 1. The engineers are working on the dia mine to improve its efficiency.
   工程师们正在对矿井进行改进以提高其效率。
2. 2. The miners are digging deep into the dia mine to find more gold.
   矿工们在矿井深处挖掘，以寻找更多的黄金。
3. 3. The dia mine is a crucial part of the mining industry.
   矿井是采矿业的重要组成部分。