bobby pin
... bobby pin 弯曲发夹 Bobierre's metal 博毕尔高锌黄铜 Bobina Perlon 博比纳-贝纶聚酰胺鬃丝 ...
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它始建初衷是由于车辆无法适应27%的坡度，因此有人建议，将其建成发夹般弯曲的盘山路以使上坡或下坡更容易些。
It was built originally because vehicles could not cope with the 27% gradient so it was suggested that switchbacks of hair pin bends were built thereby making the ascent or descent more manageable.
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