bill of sale

例句：

1. 1.The seller signed the bill of sale before leaving the premises.
   卖方在离开现场前签署了销售单。
2. 2. The buyer received the bill of sale and paid for the goods.
   买方收到了销售单并支付了货物的费用。
3. 3.The seller provided a copy of the bill of sale to the buyer as proof of payment.
   卖方向买方提供了销售单的副本，作为付款证明。