1) They were mining for coal .
他们在采煤。
2) They are mining for coal.
他们在开采煤矿。
3) They were shovelling coal up.
他们在铲煤。
4) They were screening coal.
他们在筛煤。
5) They were mining for gold.
他们在采金。
6) They were picking cotton.
他们在采棉花
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。
参考词条