H: That is right. I had two external examiners for my PhD dissertation, one of whom was Joseph Needham and the other was Willy Hartner, of Frankfurt University, the European authority on the history of Chinese astronomy.
答：是啊，當時我的博士論文有兩位校外審查委員，李約瑟是一位，另一位是西德法蘭克福大學校長 Willy Hartner，他是歐洲中國天文史權威。