1840年，传统纪年中的年号为清宣宗道光二十年，庚子年（鼠年）。
原声例句
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Well, this is ridiculous because people were making cannons long before 1840.
当然了，这个故事毫无道理,因为人们制作加农炮还是1840年以前的事情了。
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Or was it 1840? Or was it really in the wake of the Mexican War when you get this massive expansion into the great southwest and the Mexican Session which we'll take up actually next week?
还是1840年,在墨西哥战争的前夕,美国大举扩张进入,广阔的西南部地区及墨西哥会议的召开,这些其实我们下周都会讲到
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