- (North American English traffic circle, rotary)
a place where two or more roads meet, forming a circle that all traffic must go around in the same direction （交通）环岛 At the roundabout, take the second exit. 到环岛后，走第二个出口。 When entering a roundabout, give way to any traffic already on it. 当进入环形交叉路口时，要给已经在上面的车辆让路。 Leave the roundabout at the second exit. 在第二个出口处驶离环岛。 There was a lot of traffic on the roundabout. 环行交叉路上车辆很多。
Wordfindersee also mini-roundaboutTopics Transport by car or lorryb2 - (North American English merry-go-round)
a round platform for children to play on in a park, etc. that is pushed round while the children are sitting on it （游乐设施）旋转平台 
- (British English) (also merry-go-round British and North American English, carousel especially in North American English)
a round platform with model horses, cars, etc. that turns around and around and that children ride on at a fairground （游乐设施）旋转平台
Idioms
swings and roundabouts
- (British English, informal)
used to say that there are advantages and disadvantages whatever decision you make （表示无论如何决定都有利有弊）有得必有失