1. They are my schoolmates.
    他们是我的同学。

2. He met an old schoolmate at the party.
    他在宴会上遇见了一位老同学。

1. 同学：其实一点也不特别,英文叫PLAYMATE,中文定义:一起玩耍、玩乐、游玩、包括玩世不恭的同伴. 区别于同学(schoolmate),同事(yokemate ),恋人(lover),夫妻(couple)现在的网站也有很多寻找玩伴的功能,例如飞信,例如网易既然这样,

2. 校友：收信人可以是朋友(friend)、同班同学(classmate)、校友(schoolmate)、室友(roommate)等,形式较随意,属于半正式文体. 2008年考研真题(道歉信)属于私人信函.

3. 同校同学：classmate 同班同学 | schoolmate 同校同学 | graduate 毕业生

4. 学友;同学：学分;分数;绩点||point | 学友;同学||schoolmate | 学生||pupil; student

1. (尤指关系要好的)同学，同窗，校友
    A schoolmate is a child who goes to the same school as you, especially one who is your friend.

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    e.g. He started the magazine with a schoolmate...
           他和一个同学创办了那份杂志。
    e.g. He was a favorite with his schoolmasters but not his schoolmates.
           学校的老师们很喜欢他，但同学们对他并不待见。

1. an acquaintance that you go to school with

    Synonym: classmateschoolfellowclass fellow