?困难状态
... 困难在于 = the problem is... 困难状态 = difficultness 囱 = chimney ...
difficultness:
difficult +? -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。