The final 20 kilometres, like some sort of supreme ordeal before we reach our goal, is tricky driving: a gravelly one-vehicle track down the mountain, with a precipitous drop on one side.

• 最后20公里路十分难走，如同到达目标前的某种最残酷的考验：沿着山边的一条仅容一车通过的碎石路，另一边是险峻的陡坡。