?名词
... 副词: impenetrably 名词: impenetrableness 前面的常见副词 almost nearly also as completely more quite virtually ...
impenetrableness:
impenetrable +? -ness
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。