switchbacks的翻译，读音

词态

例句

The mailman would arrive on a motor-scooter, sputtering up the switchbacks of the driveway; the farm plow was horse-drawn. 当年，邮差是踩着机动滑板车，穿行在乡间蜿蜒起伏的车道上，一路发出突突声。

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. 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。