non-banded coal 非带状煤 ; 非条件状煤

indistinctly banded coal 不明显条带状煤

wide-banded coal 宽条带状煤

dull-banded coal 暗淡条带煤

thin-banded coal 薄条带状煤

rare-banded coal 稀有层状煤

banded coal types 带状煤型

finely banded coal 薄条带状煤

banded coal mining 条带采煤