=========跟单区（id,item, qty, link, price, contact)=============
跟单
1. item：GNC Women's Prenatal Formula with Iron, 60 Caplets
qty : 2
link: http://www.gnc.com/product/index.jsp?productId=3334258
price: $9.99
2. item：GNC Hair, Skin & Nails Formula, 120 Caplets
qty : 2
link: http://www.gnc.com/product/index.jsp?productId=3943821
price: $19.99
qty : 2
link: http://www.gnc.com/product/index.jsp?productId=3334258
price: $9.99
2. item：GNC Hair, Skin & Nails Formula, 120 Caplets
qty : 2
link: http://www.gnc.com/product/index.jsp?productId=3943821
price: $19.99
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