When were the first mechanical floor cleaners, which later became vacuum cleaners, invented?
第一台机械地板清洁机，后来变成真空吸尘器的机器是什么时候发明的？
Mechanical floor
原声例句
6 Minute English 六分钟英语
6 Minute English 六分钟英语
Earlier I asked you: When were the first mechanical floor cleaners invented?
第一台机械地板清洁机是什么时候发明的？
切达科学解读
In 2019, The Department of City Planning passed a bill for residential towers requiring mechanical floors higher than 30 feet to count towards the total zoning floor area.
2019 年，城市规划部通过了一项住宅楼法案，要求机械楼层高于 30 英尺才能计入总分区建筑面积。
英语百科
Mechanical floor
A mechanical floor, mechanical penthouse, or mechanical level is a story of a high-rise building that is dedicated to mechanical and electronics equipment. "Mechanical" is the most commonly used term, but words such as utility, technical, service, and plant are also used. They are present in all tall buildings including the world's tallest skyscrapers with significant structural, mechanical and aesthetics concerns.
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