一个混合的学生群体可以改变课堂的活力，有利于学生学习。
A mixed student body may change the classroom dynamics and benefit learning.
芮：在中国英语学习群体中，这是个备受瞩目的比赛。
Rui: The competition was very high-profile among China's English learning community.
一个群体间互相学习叫做文化传播。
Group members teaching each other is called cultural transmission.
一个群体间互相学习叫做文化传播。
Group members teaching each other is called cultural transmission.
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