memo /ˈmeməu, ˈmi:məu / n. ［c］( memorandum的简写形式，pl.memos) 非正式的商业文件；备忘录：draft/write a memo写一便函 I made a memo on my memo-pad to buy more coffee. 我在记事簿上记下了要再买些咖啡。She circulated a memo to the staff.她把内部便函散发给员工。
memorandum /ˌmeməˈrændəm/ n. (［c］pl. memorandums或memoranda /ˌmeməˈrændə/) 非正式的商业文件，备忘录：a memorandum book备忘录；draft/draw up/prepare/write a memorandum起草/写一份备忘录；protest memorandum抗议书 The two countries signed a memorandum of understanding on economic cooperation.两国签署了经济合作谅解备忘录。The Secretary notes down the date of the meeting in her memorandum book.秘书把会议日期都写在记事本上。
