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发现了案件的突破口：事主购买的保健品都是通过快递送货上门的，货到付款。
Police found all the health supplements Qiu purchased were delivered by courier.
youdao
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送货上门、货到付款，无条件退换货。
Home delivery, cash on delivery, unconditional return policy.
youdao
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送货上门、货到付款，无条件退换货。
Home delivery, cash on delivery, unconditional return policy.
youdao