claused bill

例句：

1. 1. The company issueda closed bill for the purchase of newequipment.
   公司发布了一份闭口账单，用于购买新设备。
2. 2. The seller provided asealed bill as proof of payment.
   卖方提供了一份密封账单作为付款证明。
3. 3. The customerdemanded a refund on the sealed bill dueto discrepancies in the invoicedetails.
   由于发票详情有出入，客户要求退款密封账单。