obstacle ['?bst?k(?)l] n. 障碍，干扰；妨害物
1.N-COUNT An obstacle is an object that makes it difficult for you to go where you want to go, because it is in your way. 障碍物 例： Most competition cars will only roll over if they hit an obstacle. 多数赛车在撞到障碍物时都会翻车。
2.N-COUNT You can refer to anything that makes it difficult for you to do something as an obstacle. 障碍 例： Overcrowding remains a large obstacle to improving conditions. 过度拥挤仍然是改善条件的一大障碍。
obstacle是可数名词，复数是obstacles
obstacle
美 /?ɑ?bst?kl/
英 /??bst?kl/
n.
障碍，干扰，妨碍；障碍物
双语例句：
The obstacle in your life is your arrogance.
你生活中的障碍是你的傲慢。
We need to remove the obstacle on the road to go through.
我们需要清除路上的阻碍以便通过。
是的，前面可以用不定冠词an。如：Where you live is not an obstacle.
以下是barrier和obstacle的区别：
1
读音不同：obstacle为英式发音[??bst?kl]，美式发音[?ɑ?bst?kl]；barrier为英式发音[?b?ri?（r）]，美式发音[?b?ri?r]。
2
词语复数形式不同：obstacle的复数为obstacles；barrier的复数为barriers。
3
用法不同：obstacle指在达到目的或前进的过程中必须消除或绕过的障碍物，也指起阻碍作用的情况；barrier常指临时的或者可能跨越的障碍1。
4
含义不同：obstacle指“阻碍前进的东西或状况”；barrier指“阻碍整个通道的阻塞物”，常用于本义2。