open pit mining

例句：

1. 1.The company has been operating an open-pit mine for decades.
   该公司几十年来一直在运营一个露天矿。
2. 2.Open-pit mining is a controversial practice that raises environmental concerns.
   露天矿开采是一个有争议的做法，引发了环境方面的担忧。
3. 3.The government has proposed regulations to regulate the open-pit mining industry.
   政府已经提出了规定来监管露天矿开采行业。