1820年是清朝嘉庆帝驾崩/道光帝继位的时间,也是清朝衰败的时期。
Is it 1820--the Missouri Crisis--in that settlement, and at least the beginnings now of a clarity of its expansion?
是从1820年的密苏里妥协案开始的吗,或者至少是从那时开始蔓延的吗
But what you've got at the top are the early 1790s and I think 1820 in terms of slave population in the American south.
一般,你们会认为南方的奴隶数量,达到高峰是在十八世纪九十年代,而我却认为1820年更准确
The cotton crop nearly doubled every decade from 1820 to 1860.
从1820年到1860年,棉花的产量每十年就翻一倍
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