1.The grandstands of public athletic fields are actually constructed to obstruct access to the fields.
公共运动场的看台，其实是为了阻拦人们去运动场地而建造的。
2.Where your vehicle will obstruct access to a fire hydrant from the roadway.
本身车辆会妨碍由行车道通往消防头的地方。
3.donot obstruct access to fire extinguishers, and put it in place where it can be easy taken if emergency happened.
把灭火器放在便于拿到的位置，不可阻塞其通道。