Some of the names which appear frequently in the Ching records were important outposts along the trail, yet try as he might he could mind no clue as to their location. "Trying to match place names to the map was like trying to decipher1 a secret code," he says.
有一些地名在清朝史料上不時出現，是道路的重要據點，可是怎麼找就是找不出線索；「地名與地圖的研判就像在解密碼一樣」，他說。