obstruction
单词辨析：
指在达到目的或前行的过程中必须消除或绕过的障碍（物），可以是具体的或抽象的东西。
Terrorism is an obstacle to peace.
恐怖主义是和平的障碍。
His car hit an obstacle yesterday in the competition.
昨天他的车在比赛中撞上了障碍物。
指做某事的障碍，通常为抽象之物。
They have decided to set a bar to competition.
他们已经决定要设置障碍以阻止竞争。
At that time being a woman was a bar to promotion in this profession.
那时在这一职业中，身为女性便是晋升的障碍。
多指产生阻碍或限制作用的政策、法律、问题等。
The removal of trade barriers means a lot to that country.
贸易壁垒的消除对那个国家而言意义重大。
What remains the biggest barrier to women succeeding at work?
女性取得事业成功的最大障碍是什么？
指堵塞道路、通道、管道等的东西。
There may be an obstruction in the drainpipe.
排水管里可能有阻塞物。
Remove the vehicle that is causing the obstruction.
把造成阻塞的车辆挪走。
相关例句：
Obstruction of the bile duct is associated with cholangitis.
胆管梗阻能并发胆管炎。
ObjectiveTo investigate the drainage effects of metallic biliary stent in malignant biliary obstruction.
目的探讨金属胆道支架引流术对恶性胆道梗阻的引流效果。
John was irritated by drivers parking near his house and causing an obstruction.
约翰对那些在他家附近泊车堵住通道的司机感到恼火。
Mr Guest refused to let them in and now faces a criminal charge of obstruction.
格斯特先生因为将他们拒之门外，现在面临妨碍公务的刑事指控。
Free from impediment or obstruction or hindrance.
不受妨碍或阻塞的，或清除了障碍的。
People with bronchial asthma, serious respiratory tract obstruction and serious respiratory insufficiency;
患有支气管哮喘、严重呼吸道阻塞和严重呼吸功能不全者；