而過去12個月的事件更讓局勢急遽惡化。
与其说是技术问题，不如说是一个被长期忽视的基础工程问题。
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And in 2003, the Columbia shuttle broke up in the skies over Texas at the end of its mission, killing its crew of seven as well.
The Mop Master technology uses 180 rotations per minute with 6N of pressure to tackle really tough stains, while the dual sweeping and mopping brushes let you pick up even the most stubborn dirt. It has 7,000 Pa of suction, a rolling brush, and a side brush, so it can pick up dirt of all kinds, from crumbs to pet hair. Its 3.35-inch low-profile design makes it perfect for reaching tight spaces and finding dust hidden under furniture.