Thus they can provide a clean vacuum over the entire vacuum range. Dry pumps require little maintenance and don't generate any waste material.

无油真空泵提供了完全洁净的真空环境，泵体本身无需保养，而且不会产生任何污染物。

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Cern had to clean "soot-like dust" from the firehose-size pipes meant to contain an extreme vacuum so that nothing would obstruct the proton beams passing through.

欧洲粒子物理研究所必须清理从消防水带那么粗的管道里冒出的“煤烟般的灰尘”，所以要安装极端超高真空设施保证质子光束畅通无阻。

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By Wednesday this week, those things were still on my list: dust, sweep, mop, vacuum, and clean the bathrooms.

这周三，我还没需要做：除尘、扫地、拖地、吸尘和清洁浴室。

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Another is that unless the country's power vacuum is filled quickly by a clean election and a credible government, one capable of rebuilding the country's institutions, years of instability and chaos could lie ahead.

ECONOMIST: Peru��s confused path to democracy

Paris employs a huge work force to keep the city clean and its use of golf cart-like vehicles to vacuum dog droppings has received admiring -- and sometimes wry -- attention in the international media.

CNN: We'll always have Paris

I've clocked it: In my modestly sized rooms, the time it takes to prepare, deploy and clean the robots isn't much less than what it takes to vacuum or sweep.

WSJ: The Surprising Benefits of Robot Cleaners