Yāpiàn zhànzhēng de qǐyīn yǔ dàyān màoyì mìqiē xiāngguān.
The cause of the Opium War was closely related to the opium trade.
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history
大烟 was a common colloquial term for opium (鸦片) in China during the 19th and early 20th centuries. The Opium Wars (1839–1842 and 1856–1860) were fought partly over Britain's right to sell opium in China.
