Cooperative learning is a specialized type of group cooperative activity.

协同学习是一种特殊的群体协同活动。

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Tight dragnet type: Each group please watch for, the target have been already appear, preparation activity!

天罗地网式：各小组请注意，目标已出现，准备行动！

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Researchers measured brain activity of 47 healthy adults -- a small but scientifically valid size group for this type of study -- while using a mobile device.

CNN: Cell phone exposure increases brain cell activity