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.

youdao

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.

youdao