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回头曲线 huítóu qūxiàn
met. hairpin curve
tech. hairpin bend; hairpin curve; hairpin turn; reverse loop curve; S-curve; switchback curve
道路回头曲线 huítóu qūxiàn
auto. hairpin curve
公路回头曲线 huítóu qūxiàn
tech. hairpin curve