For example, in the Tang dynasty Uigurs were employed at court. In the Yuan dynasty, Marco Polo served as an official. And in the Ching dynasty, Matteo Ricci served as the official in charge of astronomy and astrology. At the end of the Ching dynasty, the Englishman Robert Hart founded the Chinese customs service, and he remained in charge of customs affairs for decades.
例如唐代回紇人入仕中廷，馬可波羅曾在元朝為官，利馬竇曾在清朝擔任欽天監，清末英國人赫得曾為我國創辦海關，而且主持關務達數十年之久。