相关单词近义词 cave 洞穴, grotto 洞穴, hollow 空的, pothole 坑洞, cavity 洞, fissure 裂缝, tunnel 隧道, hole 洞, catacomb 地下墓穴, opening 开口underground chamber, 地下洞室, chamber 室, underground 地下的, cavern out 挖空临近词cavernous, caveat, Caverni, caverna, caverned, cavernosa, cavernose, cavernula, cavernosu, cavernoma, cavernomas, cavernosus 返回 caverns