1.official letter
公函收藏指正
2.She received an official letter of explanation.
她收到一封官方解释函。收藏指正
3.affix a seal to an official letter
在公函上盖印章收藏指正
4.Note: Delegates are reminded to have an official invitation letter for WUF4 prior to reserving your hotel accommodation.
注意：在预订酒店房间前请确保您已经收到WUF4论坛的官方邀请函。收藏指正
5.exempt by means of an official pass or letter, as from customs or other checks.
像从进品税或其它检验中用官方护照或信件中免除。收藏指正
6.The seller issues FCO, Buyer signs and returns it to the seller with official bank comfort(confirm?) letter.
卖方出据FCO合同正式更改确认书，买方签字，回给卖方，随附银行的意愿书。收藏指正
7.The award letter, on official looking stationery printed at the high school where Harold was assistant principal, came from "The Institute for the Destitute."
这封得奖信，被放在哈洛德当助理校长的那个学校的公文用信封内，上头有“贫民救济机构”的字样。收藏指正
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