obstacle
n. 障碍，阻碍；障碍物
复数 obstacles
例句
Overcrowding remains a large obstacle to improving conditions.
过度拥挤仍然是改善条件的一大障碍。
《柯林斯英汉双解大词典》
A lack of qualifications can be a major obstacle to finding a job.
学历不足可能成为谋职的主要障碍。
《牛津词典》
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。
