协同学习是一种特殊的群体协同活动。
Cooperative learning is a specialized type of group cooperative activity.
残疾人是特殊的群体，我们应该体谅点。
The disabled people are special part, we should be considerate.
企业销售人员是特殊的群体，他们的努力程度直接影响企业的业绩。
Enterprise sales force is a special group, the extent of their efforts directly affect the performance of enterprises.
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