这是一份不可撤消信用证、是不能更改的。
It Is an irrevocable letter of credit which can not be changed.
请通知受益人，我们对第1200号信用证中，5箱更改为10箱，其余部分不变。
Please advise the beneficiaries that we shall amend the Credit No.1200 to read ten boxes of the articles instead o f5 boxes, otherwise unchanged.
这是一份不可撤消信用证，是不能更改的。
It is an irrevocable letter of credit which can not be changed.
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