open mines

• 露天矿

open mines的用法和样例：

例句

1. Rain has serious effect on the operation of long and narrow deep open pit.
   降雨对狭长深凹露天矿的生产有严重的影响。
2. Most of large and middle scale open-pit mines in China have reached deep mining.
   摘要我国的大多数大中型露天矿山已经或即将进入深部开采。