First you must find out the clause of the quality problems and furnish sufficient evidence.
首先你的查查有关质量问题的条款,并提供足够的证据。
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。