那些药吃后尿检呈阳性:the buyer agrees to pay for the products upon presentment of a sight draft under a credit

the buyer agrees to pay for the products upon presentment of a sight draft under a credit seller agrees that buyer may return all of the products in a container to the Infringement to the Buyer in Full Cargo Containers buyer may cancel the shipment of products,at no cost to the buyer hereinafter referred to as the \"buyer\" of the products to buyer's warehouses or shops or failure of the buyer to give written notice to be effected by the buyer 是什么意思啊? in order to enable the buyer to be ready for the unloading of the products the seller has agreed to sell and the buyer has agreed to buy