hairpin bend

noun

1. （尤指山路的）急转弯
   a very sharp bend in a road, especially a mountain road

1. （道路的）急转弯
   A hairpin bend or a hairpin is a very sharp bend in a road, where the road turns back in the opposite direction.

1. There's a hairpin bend at Woodbine and the track in Barbados was very compact.
   活拜马场有个又急又窄的弯位，巴巴多斯的跑道也十分狭窄。

noun

1. a U-shaped bend in a road