Top view of square head set screw. Selection box represents thread diameter.

方头螺钉的俯视图。选择框代表螺纹直径。

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Gathering up the thread of his story, he set about writing.

他整理好故事的脉络，便开始写作。

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Gathering up the thread of his story, he set about writing.

他整理好故事的脉络，便开始写作。

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