obstacle

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

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

Overcrowding remains a large obstacle to improving conditions. 过度拥挤仍然是改善条件的一大障碍。