Also worthy of note is that Taiwan already had developed external trade, exchanging goods with Japan and Western colonial possessions. In Western trade records, Cheng Cheng-kung is referred to as the "King of Formosa."
值得一提的是，當時台灣已有對外貿易，與日本、西歐殖民等國都有貿易往返，而外國貿易文書中將鄭氏稱作「台灣國王」。