未知题型 用户购买的衣服，吊牌不在了，无法办理退换货（）

未知题型 一件商品只可开具一次发票，为增值税普通发票，用户收货后可申请开具（）

未知题型 The author offers insights as to why friends end. The friends face may change. The friends may change. One or both of the friends might the friendship. can also cause the end of friendships.