=========跟单区（id,item, qty, link, price, contact)=============
跟单ginkgo
id: twinhills
item: GNC Herbal Plus Standardized Ginkgo Biloba 60mg 300 Capsules
qty: 2
link: http://www.gnc.com/product/index.jsp?productId=2539690
price: 39.99 x 1.5 (2nd item 50% off) = 59.99
contact: 团长有
item: GNC Herbal Plus Standardized Ginkgo Biloba 60mg 300 Capsules
qty: 2
link: http://www.gnc.com/product/index.jsp?productId=2539690
price: 39.99 x 1.5 (2nd item 50% off) = 59.99
contact: 团长有
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