发展的主要障碍是这个国家人口太多。 The main impediment to development is the country's large population.
栏障一种由一连串浮木连着别的自由浮木而成的障碍物，特别用于拦截漂浮残骸或阻止通行 A barrier composed of a chain of floating logs enclosing other free-floating logs, typically used to catch floating debris or to obstruct passage.
我认为你说美国是世界和平的障碍是不对的。 I don't think it is correct of you to say that America is a balk to world peace.
栅栏，路障，防御横跨地设在进入线路上，用来阻止敌人通过 A structure set up across a route of access to obstruct the passage of an enemy.
铁蒺藜由钉在林桩上的有刺铁丝或尖钉构成的用来阻挡敌人的前进障碍物 An obstacle composed of barbed wire or spikes attached to a wooden frame, used to block enemy advancement.
