1、obstacle

障碍物

Most competition cars will only roll over if they hit an obstacle.

大多数赛车只有在撞上障碍物时才会翻车。

He left her to navigate her own way round the trolleys and other obstacles.

他扔下她一个人在一堆手推车和其他障碍物之间绕来绕去。

障碍；困难；阻碍

Overcrowding remains a large obstacle to improving conditions.

过分拥挤仍然是改善环境的一大障碍。

To succeed, you must learn to overcome obstacles.

必须学会克服困难才能成功。

2、instant

瞬息;顷刻;刹那

For an instant, Catherine was tempted to flee.

有那么一会儿,凯瑟琳很想逃跑。

The pain disappeared in an instant.

疼痛立刻就消失了。

(某一)时刻

At that instant the museum was plunged into total darkness.

就在那时,博物馆陷入了一片漆黑。

In the same instant he flung open the car door.

与此同时,他猛地推开了车门。