下面是哥伦比亚大学的qa网页中的一段回答，关于投递推荐信的方式

godld

下面是哥伦比亚大学的qa网页中的一段回答，关于投递推荐信的方式：

http://gsas.columbia.edu/faq

We accept letters from dossier services, such as Interfolio, or university career services offices.  These letters may be submitted in two different ways.

• Hard Copy Submission:If the letter service will be mailing hard-copy recommendations to our office, you are still required to enter the names and email addresses of your evaluators on the online application. You may inform your referees that they may disregard the email requesting a letter on your behalf. The letter service should then mail the letters to the Office of Admissions; we will then upload scanned copies of the letters into our application system. Please be aware that mailed letters require a longer processing time.
  
  

• Electronic Submission:If you are using Interfolio, please see the Interfolio Help Center for instructions on how to use the Interfolio service to deliver the letters to your Columbia application.
  If a career services office will be submitting the letters on your behalf, you will have to contact that office to ascertain whether they have a system in place which permits electronic submission of individual letters to our online application.
  Note: In order to make use of electronic submission, the letters must be emailed as individual documents directly to our application system. We do not accept letters emailed from letter services to a Columbia GSAS email address.
  
  电子传送中的career service office 是什么，这小段话有人能讲解一下吗？
  
  thanks verymuch