O 开头单词
obstructionist n. 妨碍者；蓄意阻挠者 adj. 阻挠议事的；蓄意阻挠的
obstructionism n.妨碍议程的手段；蓄意阻挠
obstruction-guard n.排障器；护栏
obstruction-free 无障碍设计
obstruction of lacrimal duct [医药科学]泪道阻塞
obstruction of justice 妨碍司法公正；阻碍司法
obstruction cocycle [数学]障碍闭上链
obstruction beacon [航空、航天科学技术]障碍物立标
obstruction n.障碍；妨碍；闭塞；违例阻挡
obstructing v. 妨碍（obstruct的ing形式）；阻塞
obstructer n.障碍物；拦路虎；起阻碍作用的人=obstructor.
obstructed adj. 阻塞的；梗阻的，不通的 v. 阻塞；妨碍；遮住（obstruct的过去分词形式）
obstruct wilfully 横加阻梗
obstruct from v. 阻挡