someone who systematically obstructs some action that others want to take
同义词：obstructionist??/??obstructor??/??resister??/??thwarter
any structure that makes progress difficult
同义词：obstruction??/??obstructor??/??impediment??/??impedimenta
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。