He learned Dutch-- and Dutch is a very difficult language-- in 1696, while the Turkish war went on, or one of them he went off to Western Europe incognito as an embassy soldier.

他学会了荷兰语,荷兰语是很复杂的,在1696年,当土耳其战争发生的时候,或者其中一次战争时,他以一名大使馆军人的身份匿名去了西欧

耶鲁公开课 - 欧洲文明课程节选