通商 tōngshāng trade Origin Definitions Defs Strokes Stroke Words Sentences Sents 五口通商 wǔkǒutōngshāng five treaty ports The five treaty ports (Guangzhou, Fuzhou, Ningbo, Xiamen, and Shanghai) forced on Qing China by the 1842 Treaty of Nanjing that concluded the First Opium War.通商口岸 tōngshāngkǒu'àn treaty port A treaty port forced on Qing China by 19th-century Great Powers.