being, situated, or operating beneath the surface of the eartha vast belowground network of tunnels
a vast belowground network of tunnels
subsurface, subterranean, underground
aboveground, surface
in 1617
英语同义词词典收录了63618条英语词条，基本涵盖了全部常用同义词或反义词的辨析及翻译，是英语学习的有利工具。