基本解釋[經(jīng)濟學]光單信用證英漢例句雙語例句Clean letters of credit are mainly used in non-trade settlement, while documentary credits are generally used in commodity trade.光票信用證主要用于非貿(mào)易結算，而在商品貿(mào)易中一般使用跟單信用證付款。documentary clean credit更多例句專業(yè)釋義經(jīng)濟學光單信用證