mm,你说的很轻的影响计算的item具体是什么东东啊?
举几个例子
http://www.amazon.com/gp/product/B001AVNK6E/ref=ox_sc_sfl_title_7?ie=UTF8&smid=ATVPDKIKX0DER
http://www.amazon.com/gp/product/B001UF8BL4/ref=ox_sc_sfl_title_6?ie=UTF8&smid=ATVPDKIKX0DER
http://www.amazon.com/gp/product/B004OR1E46/ref=ox_sc_sfl_title_8?ie=UTF8&smid=ATVPDKIKX0DER
http://www.amazon.com/gp/product/B001UF8BL4/ref=ox_sc_sfl_title_6?ie=UTF8&smid=ATVPDKIKX0DER
http://www.amazon.com/gp/product/B004OR1E46/ref=ox_sc_sfl_title_8?ie=UTF8&smid=ATVPDKIKX0DER