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加湿器总体市场销量在逐年增加,与2007年相比,2008年的加湿器市场的零售量同比增长13.13%,额同比增长14.46%。上升的原因是什么?请看中怡康的数据分析。
The overall market volume of humidifiers is increasing year by year. Compared with 2007, the retail sales volume of humidifier market in 2008 increased by 13.13% over the same period of last year, with a year-on-year increase of 14.46%. What is the reason for the rise? Please take good care of the data analysis.