"信保订单"在英文中叫做"Letter of Credit (LC)".
"Letter of Credit" 来源于商业交易中，用于在买方和卖方之间提供信用保证。买方的银行会给卖方银行发送一封信，保证在卖方按照合同条款交付货物后，买方银行会支付款项。这样可以确保卖方在交货前就能收到款项，而买方在收到货物后才需要支付款项。
例句：
"The seller will only ship the goods after the buyer's bank issues a letter of credit."
中文翻译："卖方只有在买方银行发出信保订单后才会运货。"
"The letter of credit guarantees that the buyer will pay the seller once the goods have been shipped."
中文翻译："信保订单保证买方在货物运出后会付款给卖方。"