The condition of the road was another problem. Where mud and gravel prevented motor vehicle traffic, the team had to rely on yaks, horses, and even their own two feet to get through.
道路的險阻則是另一個難題，在車子無法行駛的泥濘或石礫路段，隊員必須依賴犛牛、馬，甚至自己的雙腿奮力行進。