obstacles
An obstacle is an object that makes it difficult for you to go where you want to go, because it is in your way.
Most competition cars will only roll over if they hit an obstacle.
多数赛车在撞到障碍物时才会翻车。
He left her to navigate her own way round the trolleys and other obstacles.
他留下她独自在手推车和其他障碍物中间穿插行走。
You can refer to anything that makes it difficult for you to do something as an obstacle.
hindrance
Overcrowding remains a large obstacle to improving conditions.
过度拥挤仍然是改善条件的一大障碍。
To succeed, you must learn to overcome obstacles.
要成功,你就必须学会克服障碍。