W：当然是不可撤销信用证了，这是国际贸易常用的付款方式。
W: Irrevocable letter of credit, of course. It's the normal terms of payment in international business.
在国际贸易中很少使用光票信用证。
Clean letter of credit is seldom used in international trade.
跟单信用证是国际贸易中最主要的一种结算支付方式。
Documentary credit is a main payment way of settlement in the international trade.
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