In order to understand his ancestors 'motives and hard work in exploring for oil, Chang visited in person the site of the first oil well drilled in Taiwan on the banks of the Houlung Chi in Miaoli.
為了對先民開發石油的情況有所瞭解，張毅首先來到台灣第一口油井的遺址﹘ ﹘苗栗出磺坑的後龍溪畔。