函用英语怎么说

函的英文：
envelope
case
letter

参考例句：

• norm functional
  范数泛函

• Fundamental concept of calculus related to areas and other quantities modeled by functions.
  微积分的基本概念，涉及函数所围成的区域的面积与数量。

• I am enclosing my resume together with my photo,andbelieve that they may be found satisfactory．
  兹随函附履历表及照片一份，谅阁下满意。

• You will find enclosed with this letter a sample of new….
  随函附上本公司新出品的……样品,请查收

• I enclose a resume for your consideration and should be grateful if you would grant me an interview.
  谨随函附上履历一份，请予考虑，倘蒙接见，不胜感激。

• Real and Functional Analysis
  实变与泛函

• Enclosed you will find a letter of recommendation from…
  随函附上……的推荐函。

• To give a letter of recommendation for finding an employment
  荐函求差

• To submit one's claim to a person
  对某某提出索赔函

• To inform you by sending an urgent letter
  飞函奉达

envelope是什么意思：
n. 信封，封皮；外壳

• envelope airship
  飞船蒙皮

• rupture envelope
  破裂包络线

• adiabatic envelope
  绝热包络线

letter是什么意思：
n. 字母；信；字面意义；证书，许可证；文学
v. 用字母标明，写字母于；写印刷体字母；赢得校名缩写字母标志

• in letter and in spirit
  在字面意义和精神实质上|无论形式和实际

• The letter was a forgery.
  这封信是伪造的。

• Post the letter through the slit in the letter box.
  把这封信从信箱的投信口投进去。

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