A roundabout is a circular structure in the road at a place where several roads meet. You drive round it until you come to the road that you want.
N-COUNT
旋转木马
A roundabout at a fair is a large, circular mechanical device with seats, often in the shape of animals or cars, on which children sit and go round and round.
N-COUNT
(儿童坐的)旋转圆台
A roundabout in a park or school play area is a circular platform that children sit or stand on. People push the platform to make it spin round.
ADJ-GRADED
(路线)迂回的,绕弯的,绕远的
If you go somewhere by a roundabout route, you do not go there by the shortest and quickest route.