Apedia

Road Steep Switchback  ˈswitʃbæk /  ◙ Noun  Railway Railroad Track

Front switchback
Back / ˈswitʃbæk / 
◙ noun 
1. a road or railway / railroad track that has many sharp bends as it goes up a steep hill, or one that rises and falls steeply many times
• (公路或铁路坡道上的)之字形路线;(公路或铁路的)不断起伏的路线
2. (NAmE) a 180 degree bend in a road that is going up a steep hill
• (陡坡路上的)急转弯,180 度的转弯
3. (old-fashioned, BrE) = roller coaster

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