从这些深矿中取得煤是很昂贵的。

The extraction of coal from these deep mines is expensive.

youdao

当地的工业依靠在矿地淘宝石或次级宝石而生，有些矿井深达40英尺(12米)。

Local industry relies on the precious and semiprecious stones found in the mines, some of which are more than 40 feet (12 meters) deep.

youdao

矿深340米，高950米，长2.1千米。

The mine has a depth of 340 meters, a width of 950 meters and a length of 2.1 kilometers.

youdao