求翻译：美 国 肯 塔 基 大 学 教 授 、“ 合 作 掌 握 学 习 ” 理 论 的 主 要 代 表 人 物Guskey.T.R.(Brown 1994)对合作学习作了比较具体的阐述:“从本质上讲，合作学习是一种教学形式，它要求学生在一些由 2 一 6 人组成的异质小组中一起从事学习活动，共同完成教师分配的学习任务。在每个小组中，学生们通常从事于各种需要合作和互助的学习活动。”是什么意思？

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