1) They are mining for coal.
他们在开采煤矿。
2) They were mining for coal .
他们在采煤。
3) They were mining for silver.
他们开采银矿。
4) Miners hew coal .
矿工们采煤。
5) They were shovelling coal up.
他们在铲煤。
6) They were screening coal.
他们在筛煤。
补充资料：他们
1.代词。称自己和对方以外的若干人。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
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