"25 male classmates" 英语可以表述为 "25 male classmates" 或者 "25 classmates who are male"。

"Male" 是形容词,表示"男性的",例如:

He is a male student. 他是一名男学生。
The male pon is the leader of the pride. 雄狮是那群狮子的领袖。

"Classmate" 是名词,表示"同班同学",例如:

My classmates and I are in the same grade. 我和我的同班同学们在同一年级。
She has been friends with her classmates since kindergarten. 她和她的同班同学们从幼儿园就交了朋友。

所以,"25 male classmates" 可以翻译为"25名男同学"。

例句:

I have 25 male classmates in my Engpsh class. 我的英语课有25名男同学。
Our group consists of 25 male classmates and 5 female classmates. 我们的组由25名男同学和5名女同学组成。