irrevocable credit meaning in Chinese

不改变信用证
不可撤销的信用状
不可撤销信用证
不可撤消的信用证
不可撤消信用证

The buyer must get his bank to issue an irrevocable credit in favour of the seller .
买方必须通过其银行开出以卖方为收款人的不可撤销的信用证。
We have opened a confirmed and irrevocable credit in your favour
以贵方为受益人,我们开出不可撤消的的保兑信用证。
We are today in receipt of cable advices from new york that they have issued an irrevocable credit
今日我们收到从纽约拍来的电报。据该电称:他们已开出不可撤销的信用证。
A preliminary advice of the issuance or amendment of an irrevocable credit ( pre - advice ) , shall only be given by an issuing bank if such bank is prepared to issue - the operative credit instrument or the operative amendment thereto
只有准备开立有效信用证或修改书的开证行，才可以对不可撤销信用证或修改书发出预先通知书。
A preliminary advice of the issuance or amendment of an irrevocable credit ( pre - advice ) , shall only be given by an issuing bank if such bank is prepared to issue - the operative credit instrument or the operative amendment thereto
只有准备开立有效信用证或修改书的开证行，才可以对不可撤销信用证开立或修改书发出预先通知书。