Take coal output for example.In 1978 the total amount of marketable coal mined in the United States was in excess of 599 million tons,and the output of raw coal in the Soviet Union was 724 million tons.

• 例如煤产量，一九七八年，美国商品煤五亿九千九百多万吨，苏联原煤七亿二千四百万吨。