Research on optimal plan of multiply group purchase.
多目标集团采购计划优化模型的研究。
John: : No matter what you say, I don't like group purchase.
约翰：不管你说什么，我就是不喜欢团购。
So when we buy in group purchase, we need to take care.
所以当我们团购时，需要小心。
Somebody exclamations group purchase winter has come.
有人惊呼团购冬天已至。
Somebody exclamations group purchase winter has come.
有人惊呼团购冬天已至。
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