美国合作学习的研究与实施由来已久。

The research and implementation of cooperative learning in America has a long history.

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第三章，研究设计与实施。

Chapter three, research design and investigation.

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第一部分：研究的设计与实施。

The first part: designing and actualizing of the research.

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因此，本课题的研究与实验有其实施的迫切性和必要性。

Thus, it is urgent and necessary to study and experiment this research.

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因此，本课题的研究与实验有其实施的迫切性和必要性。

Thus, it is urgent and necessary to study and experiment this research.

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