confirmed letter of credit

基本解释

Payment should be made by irrevocable and confirmed letter of credit.
款项烦请以不可撤销保兑之信用状支付。
We are pleased to inform you that we have opened an irrevocable and confirmed letter of credit.
本公司很高兴通知贵方，本公司已开立了一张不可撤消的保兑信用证。
yiparts.com
Either because the credit amount is too large, or because he does not fully trust the opening bank, sometimes the exporter may require a confirmed letter of credit.
要么因为信用证金额过大，要么因为对开征行不完全信任，出口商有时可能需要保兑的信用证。
edu.sina.com.cn