航海史 hánghǎishǐ history of navigation Origin Definitions Defs Strokes Stroke Words Sentences Sents 1 sentence 郑和下西洋是中国航海史上的壮举。 Zhèng Hé xià Xīyáng shì Zhōngguó hánghǎishǐ shàng de zhuàngjǔ. Zheng He's voyages to the Western Oceans were a great feat in Chinese maritime history. Source: Dong Chinese Dictionary