1·Hey, I got the whole info from the upperclassman.
喂，我已经从学长那里拿到所有的资料了。
2·We are gathered here today to send off one of our upperclassman, Mr. Smith, who has been appointed to his new post in London.
今天在这里我们在这里相聚，为我们的学长史密斯先生送别，他被派到伦敦担任新职。