大学的邀请函用英语怎么说

1. 对方学校发的邀请信的英文应该怎么说

邀请信
1.an invation letter
2.a letter of invitation

例句
1.有朝一日，能力得到了肯定，项目现有的提交者之一将发给一封邀请信。
Then one fine day, an existing committer of the project will send you an invitation
to become a member.
2.此外，两个亲戚在首次试着通过邀请信登录网站时都收到了错误讯息。
Also, two of my relatives received error messages when first trying toaccess the site with my invitation.
3.我看你床头柜上放着邀请信。
I saw the invitation on the nightstand.
短语
邀请信- a letter of invitation
中文邀请信letter of invitation in Chinese
舞会邀请信 dance invitation