求翻译：信用证方式有三个特点： 　　1.信用证是一项自足文件。信用证不依附于买卖合同，银行在审单时强调的是信用证与基础贸易相分离的书面形式上的认证； 　　2.信用证方式是纯单据业务。信用证是凭单付款，不以货物为准。只要单据相符，开证行就应无条件付款； 　　是什么意思？

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In the form of a letter of credit has three features: 1. The letter of credit is a self-contained files. The letter of credit does not tied to a contract for the sale of the banks, in the review, emphasized that the letters of credit and the foundations of the trade, separate from the formal written

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Letter of credit has three characteristics: 1. a letter of credit is a self-contained file. Is not attached to the contract of sale, the Bank stressed in documents are letters of credit and trade separate from writing to certification on the basis; 2. the letter of credit is a pure business document

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