flat [flæt]

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adj.平的；平坦的；n.（英）公寓住宅；单元住宅

level and smooth , with no curved , high, or hollow parts

Of course, no one now believes that the earth is flat. 当然如今无人相信地球是平的。
The building has a flat top. 这栋高楼的顶是平的。