名词中文翻译
中文翻译：煤炭层
同义词：
['coal seams', 'coal strata', 'coal bed']
例句：
-
1.The lower coal measures are rich in minerals.
下煤层富含矿物。
-
2. The geologists have been studying the lower coal measures for years.
地质学家们已经研究下煤层多年了。
-
3.The lower coal measures were mined by hand before the advent of machinery.
在机械出现之前，下煤层是手工开采的。