毕业生代表，英文表述为"valedictorian"，意思是在毕业班级中成绩最优秀的学生。这个词来源于拉丁文，valedictorian的原意为"说再见的人"，因为毕业生代表通常会在毕业典礼上发表演讲，为班级的毕业生们送上最后的祝福。

下面是一些关于毕业生代表的英文例句和中文翻译：

"Jane was chosen as the valedictorian of her graduating class because of her outstanding academic achievements." (简因为她优秀的学术成就被选为毕业生代表。)
"The valedictorian gave a moving speech at the graduation ceremony, thanking her classmates and teachers for their support." (毕业生代表在毕业典礼上发表了动人的演讲，感谢同学和老师的支持。)
"Being named valedictorian is a great honor, and it's a testament to all of the hard work and dedication that goes into earning that title." (被选为毕业生代表是一项巨大的荣誉，这是对所有的努力和奉献的见证。)