?无烟煤煤系
... 煤系植物 coal measures plant 无烟煤煤系 culm measures 下部煤系 lower coal measures ...
The Culm Measures area of north Devon covers 60, 000 hectares and is in three pockets.
BBC: Making a home for rare wildlife in north Devon
英汉双解词典包含3185865条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。