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(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.
例句
He started the magazine with a schoolmate...
他和一个同学创办了那份杂志。
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。