1799年是中国农历的己未年（羊年）；中国清朝嘉庆四年；越南景盛三年；日本宽政十一年。
原声例句
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.. In 1799, it would cost so much to mail a letter-- I don't know exactly, something like $10 or $20 to mail a letter at today's rate-- and it would take a long time get there.
在1799年，寄封信需要花费-,我也不清楚具体的数字,大概相当于现在的10到20块钱-,而且还要花很久才能送达。
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