block in []

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附加级

v. 画草图, 草拟, 堵塞

You'd better block in a plan of the building. 你最好还是画张这栋建筑的草图. 来自《简明英汉词典》
They are trying to block in the space. 他们正在设法把空隙填满. 来自《简明英汉词典》