a blind letter  死信

a circular letter  通知

a letter  信件

a letter sent as thanks for being treated well as someone’s guest  作战管理语言

acceptance letter of credit  承兑信用证

accepted letter of credit  小豆; 已承兑信用证

accompanying letter  附函

advice of transfer of letter of credit  信用转让通知

Advisory Letter  劝喻信

advisory letter [slope maintenance]  劝喻信

advisory letter of commutation  减刑建议书

air letter  统筹方法; 关键路径法; 航空信

airmail letter  航空信

allocation letter  拨款信件

amend a letter of credit  修改信用证明书

amount of the letter of credit  信用证金额

an anonymous letter  匿名信

an informal letter sent by an organization  便函

anonymous letter  匿名信

anticipatory letter of credit  预支信用证