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. 障礙物

Most competition cars will only roll over if they hit an obstacle. 多數賽車在撞到障礙物時都會繙車。

2. N-COUNT You can refer to anything that makes it difficult for you to do something as an obstacle. 障礙

Overcrowding remains a large obstacle to improving conditions. 過度擁擠仍然是改善條件的一大障礙。