同比下降”指本年累计指标与上一年同月份的累计指标之间的比。
五月份挖掘机销售量同比下降10%，可能预示着建筑行业的不景气。
Excavator sales fell 10 percent in May from a year earlier, possibly foreshadowing a construction bust.
第二季度企业收益同比下降超过30%。
Its revenues dropped more than 30% in the second quarter compared with a year earlier.
美国内粗钢生产量年同比下降了47%。
American raw domestic steel production is down 47% year on year;
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