信用证(L/C---lettle of credit)是一种有条件的银行付款承诺，承担第一付款责任，是一种银行信用，代替买卖双方负责付款和提交单据，对进出口双方（特别是彼此不熟悉的客户）的利益较有保障。
In L/C transaction, the banker is responsible to pay money and tender documents on behalf of both parties.
人们不再是面对面的、看着实实在在的货物、靠纸介质单据（包括现金）进行买卖交易。
People are no longer face-to-face , look at the true goods , depend on the paper medium document (including the cash ) to carry on the business transaction.
信用证结算是一种单据买卖行为。
The letter of credit balance of accounts is a kind of voucher business behavior.
除买卖合同有规定外，单据不用航空寄递。
The documents shall not be forwarded by air route unless the contract of sail so provides.
除买卖合同有规定外，单据不用航空寄递。
The documents shall not be forwarded by air route unless the contract of sail so provides.
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