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。

Some point out that neither elephants nor giraffes sport long, thick tails to obstruct male access.

一些学者指出，大象和长颈鹿都不会摆动它们又长又粗的尾巴来阻止雄性的靠近。

A structure set up across a route of access to obstruct the passage of an enemy.

栅栏，路障，防御横跨地设在进入线路上，用来阻止敌人通过。