教室的英语表达是：classroom，具体解析如下：
一、音标： 英 ['klɑːsruːm] 美 ['klæsruːm]
二、意思：
n. 教室；课堂
三、词语搭配：
classroom capacity 教室容量
classroom climate 课堂气氛；教室气氛
go to the classroom 去教室
Flipped classroom 翻转课堂
Classroom English 课堂英语
The Drifting Classroom 漂流教室
in the classroom 在教室里 ; 在课堂上
classroom instruction 课堂说明
classroom teaching 课堂教学
classroom building 教室楼；教学楼
四、例句：
He is repairing desks and chairs in the classroom.
他正在教室里修理桌椅。
A teacher is responsible for the conduct of pupils in the classroom.
老师对学生在教室里的行为负责。
The teacher stands in the front of the classroom.
教师站在教室的前部。
My seat is in the fore part of the classroom.
我坐在教室前部。
She came into the classroom on the sly.
她悄悄地进入了教室。