=========跟单区（id,item, qty, link, price, contact)=============
跟单
id: song1984
item: GNC Triple Strength Fish Oil 1500 120 softgels
qty: 12
link: http://www.gnc.com/product/index.jsp?productId=12643680
price: $39.99 (buy one get one free)
contact: 98602455
item: GNC Triple Strength Fish Oil 1500 120 softgels
qty: 12
link: http://www.gnc.com/product/index.jsp?productId=12643680
price: $39.99 (buy one get one free)
contact: 98602455
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