短语词组短语Block out coal 把煤切割成块block k coal 块煤block top coal 块体顶煤Added Block of Coal 增加煤炭块Block of Coal 煤炭块block caving coal mining method [矿业]大块崩落采煤法block -coal-image 块煤图像block coal rate 块煤率big block coal 大块煤率 返回 block coal