Brooms, brushes, mops and feather dusters, hand-operated mechanical floor sweepers, not motorized, of other materials.

其他材料制帚，刷，拖把及毛掸(包括其他材料制非机动的手工操作地板清扫器等)。

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There's a wide-spaced double-glazed wall, which channels hot air upwards to a mechanical floor where it's harnessed for dehumidification.

有一个大范围的间距双层玻璃墙，将热空气向上引导到一个机械楼，以为除湿提供动力。

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Brooms, brushes, mops and feather dusters, hand-operated mechanical floor sweepers, not motorized, of other animal or vegetable materials.

其他动植物材料制帚，刷，拖把等(包括动植物材料制非机动的手工操作地板清扫器、毛掸)。

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Pedro Ribeiro, a spokesman for Mr. Gray, said they are talking about giving developers an extra 15 feet or so to build another floor atop offices or apartments in the city's core, on space currently used only to house mechanical equipment.

WSJ: Is It Time for D.C. to Grow Up?