名词
中文翻译：煤床
同义词：
['coal seam', 'coal bedrock', 'coal sear']
例句：
-
1.The coal mine is located in the heart of the mountain range.
煤矿位于山脉中心。
-
2.The coal seam is thin and difficult to extract.
煤层薄且难以开采。
-
3.Coal seams are formed by the accumulation of organic matter over millions of years.
煤层由数百万年的有机物质积累形成。