[已解决 不能用]这样的情况是不是实习的推荐信就无效了？

Cornell家的，一共要求两篇推荐信

Letters must be submitted by faculty members from your college or institution who are acquainted with your work. If that work occurred some time ago, check with the field to see whether recommendations from those familiar with your professional performance might be acceptable.

是不是在公司实习的推荐信就不能用了呢？