复数
鬼怪探窟员 ; 精灵探窟员
帽子
He hit on hydrogen sulfide as a potential knockout after watching a television program in 2002 about spelunkers who had to wear respirators when exploring caves filled with the toxic gas.
FORBES: Magazine Article
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。