But somehow I got my days mixed up and didn't realize the mistake until now.
可是不知道怎么回事,我把日期弄错了,而且到现在才知道这个错误。
By 1820 the population of New York had grown to about 125,000, making it the largest city in the USA.
到1820年,纽约市的人口增长到12。5万人左右,使它成了当时美国最大的城市。