tōng shāng
having trading relations (of nations or regions)
tōng shāng kǒu àn
treaty port, forced on Qing China by the 19th century Great Powers
wǔ kǒu tōng shāng
the five treaty ports forced on Qing China by the 1842 treaty of Nanjing 南京條約|南京条约 that concluded the First Opium War, namely: Guangzhou 廣州|广州, Fuzhou 福州, Ningbo 寧波|宁波, Xiamen or Amoy 廈門|厦门 and Shanghai 上海