单词：compensating filter
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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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六级作文在备考过程中既要多记忆一些作文模板，又要多找话题，多练习自己构思作文的能力，下面就跟小编一起学习作文模板，提升自己的作文水平吧！ 一、原因 1.A number of factors are accoun
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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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高考英语作文常用句型 一)原因 1.A number of factors are accountable for this situation. A number of factors might contribute to (lead to )(account for ) the phenomenon(problem). 2. The answer to this problem involves many factors. 3. The
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（一）原因1.A number of factors are accountable for this situation. A number of factors might contribute to （lead to ）（account for ） the phenomenon（problem）。 2. The answer to this problem involves many factors. 3. The phenomenon ma
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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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