letter of undertaking

英 [ˈletə(r) ɒv ˌʌndəˈteɪkɪŋ]

美 [ˈletər əv ˌʌndərˈteɪkɪŋ]

担保书；承诺书；承诺保证函

Statement on sources of the funds, and Letter of Undertaking promising not to withdraw funds during the approved period;
（五）资金来源说明书及批准时间内不撤资承诺函；
Irrevocable letter of credit: form of letter of credit whereby the issuing bank gives an undertaking to the beneficiary that payment will be made, provided that the beneficiary complies with the terms of the credit.
不可撤销的信用证：一种信用证形式，表明发证银行对受益人承担的一种义务，即只要受益人遵守信用证的条款，银行就予付款。
Upon issuance of Bank Independent Bond or Standby Letter of Credit, Bank Independent Guarantee integrate all the functions as guarantee, financing and payment under an uniformed business system, which is based on the traditional undertaking nature and independent principals of documentary credits.
该业务通过签发银行独立保函或备用信用证，在实现传统担保功能的基础上，吸收了商业信用证的独立性原则，形成了集担保、融资与支付功能为一体的业务运作机制。