函的英文：
envelope
case
letter

參考例句：
  • norm functional
    范數(shù)泛函
  • Fundamental concept of calculus related to areas and other quantities modeled by functions.
    微積分的基本概念，涉及函數(shù)所圍成的區(qū)域的面積與數(shù)量。
  • I am enclosing my resume together with my photo,andbelieve that they may be found satisfactory．
    茲隨函附履歷表及照片一份，諒閣下滿意。
  • You will find enclosed with this letter a sample of new….
    隨函附上本公司新出品的……樣品,請查收
  • I enclose a resume for your consideration and should be grateful if you would grant me an interview.
    謹(jǐn)隨函附上履歷一份，請予考慮，倘蒙接見，不勝感激。
  • Real and Functional Analysis
    實(shí)變與泛函
  • Enclosed you will find a letter of recommendation from…
    隨函附上……的推薦函。
  • To give a letter of recommendation for finding an employment
    薦函求差
  • To submit one's claim to a person
    對某某提出索賠函
  • To inform you by sending an urgent letter
    飛函奉達(dá)

envelope是什么意思：
n. 信封，封皮；外殼
  • envelope airship
    飛船蒙皮
  • rupture envelope
    破裂包絡(luò)線
  • adiabatic envelope
    絕熱包絡(luò)線

letter是什么意思：
n. 字母；信；字面意義；證書，許可證；文學(xué)
v. 用字母標(biāo)明，寫字母于；寫印刷體字母；贏得校名縮寫字母標(biāo)志
  • in letter and in spirit
    在字面意義和精神實(shí)質(zhì)上|無論形式和實(shí)際
  • The letter was a forgery.
    這封信是偽造的。
  • Post the letter through the slit in the letter box.
    把這封信從信箱的投信口投進(jìn)去。

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