Yāpiàn zhànzhēng de qǐyīn yǔ dàyān màoyì mìqiè 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.
