the 1840s; 1840's; 1840s; the 1840s'
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the 1840s; 1840's; 1840s; the 1840s'
the 1840s; 1840's; 1840s; the 1840s'
the 1840s; 1840's; 1840s; the 1840s'
the 1840s指十九世纪四十年代；1840's指1840年.
1、We recently surveyed newspaper coverage of space weather events since the 1840s and discovered that a significant change occurred around 1950
我们最近调查了自1840年代起，刊登于报纸上的太空气象事件报导，发现从1950年左右起发生了明显的变化<...
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1、We recently surveyed newspaper coverage of space weather events since the 1840s and discovered that a significant change occurred around 1950
我们最近调查了自1840年代起，刊登于报纸上的太空气象事件报导，发现从1950年左右起发生了明显的变化
2、The custom of Halloween was brought to America in the 1840's by Irish immigrants fleeing their country's potato famine
1840年，爱尔兰移民因他们国家遭受土豆饥荒而将万圣节的传统带到美国
3、The people of 1840s Missouri are a superstitious group, and Tom and his friends are no exception
一八四○年代密苏里地区的人们是很迷信的，汤姆跟他的朋友们也不例外
4、
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18世纪40年代,1840年的;1810---1840年；18世纪40年代的