cla room discipline 课堂纪律
cla room ychological environment 课堂心理环境
clean the cla room 打扫教室
Online Cla room 在线课堂
terrace cla room 阶梯教室
cla room dynamics 课堂气氛
electronic cla room 电子教室
clearn the cla room 打扫教室
Many classmates jumped up from the seat. The cla room became noisy.
许多同学从座位上跳了起来，教室变得热闹起来。
But we must not lose sight of the fact that there are advantages to studying in the cla room, too.
但是，我们不能忽视在教室里学习也有好处这一事实。
Some students went out of the cla room while talking and laughing. Two girls were singing a song on their seats.
一些学生说着、笑着出了教室，两个女孩坐在座位上唱歌。
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