农业。按每个农业劳动力能够供应多少人口来计算(包括粮食、肉类、乳类等产品),美国在1820年时,每个劳劝力可供4.1人;1980年可供60人。而我国,目前每个农业劳动力能提供的产品不足供给4人。也就是说,在这一指标上,中国比美国大约相差160年。钢产量。美国在1887年时,人均57公斤。1986年时,中国钢产量人均约50公 agriculture. According to how many people each agricultural laborer can supply to calculate (including food, meat, milk and other products), the United States in 1820, each labor force can be provided for 4.1 people; 1980 for 60 people. In our country, at present, there are not enough products for each agricultural laborer to supply 4 people. In other words, on this indicator, China is about 160 years different from the United States. Steel production. The United States in 1887, per capita 57 kg. In 1986, China’s steel output was about 50 kilometers per capita