At this point, they are working on the research and writing portion of the project.

同学们展开了这个活动的调查研究和书写部分。

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Two years of his research went into the writing of the book.

为了写那本书，他花了两年的时间作研究。

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Two years of his research went into the writing of the book.

为了写那本书，他花了两年的时间作研究。

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