求翻译：备用信用证是适应于《跟单信用证统一惯例》的一种特殊形式的信用证，是开证行对受益人承担一项义务的凭证。备用信用证在开立后即是一个不可撤销的、独立的、跟单的具有约束力的承诺，并且无需如此说明。因为备用信用证是不可撤销的，除非在备用正中另有规定，或经对方当事人同意，开证人不得修改或撤销其在备用正下的义务。是什么意思？

Standby letter of credit is to adapt the "Uniform Customs and Practice for Documentary Credits," a special form of letters of credit, the issuing bank is the beneficiary undertake an obligation on the certificate. Standby letter of credit in the open after an irrevocable, independent, with a single

Stand-by letter of credit is adapted to the Uniform Customs and Practice for Documentary Credit a special form of letters of credit, the opening Bank assumes an obligation to the beneficiary's title to it. After the opening of the stand-by letter of credit in that it is an irrevocable, independent,

The spare letter of credit is adapts in "Freight bill Letter of credit Unification Convention" one special form letter of credit, is opens the card line to undertake a voluntary certificate to the beneficiary.The spare letter of credit is one cannot be abolished, independently, the fre

Standby letters of credit are adapted to the documentary credit unification Convention a special form of letter of credit, is the beneficiary of an obligation of the issuing bank credentials. Standby letter of credit opening, is an irrevocable and independent, documentary and binding commitment, and