短语词组短語coal thawing pit 煤的解凍庫non -coal open pit 非煤露天鑛山water in coal pit 鑛井水small -coal pit 小煤窰ancient coal pit 古煤窰Huachu coal pit 化処鑛井Huojitu excavated coal pit 活雞兔採煤塌陷區coal pit a surname 煤坑coal pit waste water 鑛井水 返回 coal pit