单词：sintered metallic filter
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The Coliseum Rome, that great 1) witness to a past rich in history, that great collection of 2) artistic masterpieces, which together, form the most complete 3) unmatchable expression of human achieve
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But the HEPA filter for Olivers Vibe got dirty very quickly. And, it was not cleanableit was simply replaceable. When it turned filthy brown, Oliver went back to Target to buy a new filter. Oddly, Target sold the F15 belt for the Vibe, but not the fi
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From VOA Learning English, this is the Health Lifestyle report. In parts of India, it is not uncommon to see people wearing a mask over their nose and mouth. The capital, New Delhi, has some of the world's dirtiest air. The pollution was a call for a
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This is Scientific American's 60-Second Science. I'm Adam Hinterthuer. Got a minute? Forget the scalpel, researchers at Johns Hopkins University have created a tool that can move easily through tissue, potentially making biopsies much less invasive.
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By Tabinda Naeem Washington, D.C. 21 May 2007 Two years ago, the National Academy of Engineering established the Grainger Challenge Prize for Sustainability. This $1 million award was designed to challenge the world's scientists to develop a practica
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Metallic，队如其名，是世界首屈一指的重金属乐队，比Bon Jovi更有名，比枪花更严肃。Metallica在不断的创造着新的音乐元素：Thrash Metal、Death Metal、Speed Metal、Black Metal，他们不甘心看着重金属摇
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