“采煤”造句

从前他们在这些峡谷中采煤.
At one time they used to mine coal in these valleys.

从前用镐和铁锹采煤.
Formerly the coal was dug with picks and spades.

当大卫到达罗伯特和斯洛格跟前时,他们还在采煤.
Robert and Slogger were still cutting coal when David reached them.