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日本汽车工业协会每五年对轿车中原材料的构成比例做一次调查.今年有关研究人员又对21种不同牌号的轿车进行了调查,最后的统计结果表明钢铁在原材料中所占比例比上次调查时的(1992年)降低了
The Japan Automobile Manufacturers Association conducts a survey every five years on the proportion of raw materials in cars. This year, the relevant researchers conducted surveys on 21 different brands of cars. The final statistics show that the proportion of steel in raw materials is higher than that of the last survey. When (1992) decreased