单词：pneumatic filter
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英文名句短语
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
365个英语简短小故事
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
2018年VOA慢速英语(一)月
托福阅读:托福阅读中需要理解的重要句子 1.Wearing masks and costumes， they often impersonated other people， animals， or supernatural beings， and mined the desired effect success in hunt or battle， the coming rain， the revi
托福英语
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
2007年VOA标准英语（五月）
Try an mnemonic device such as an acronym sentence like Raging Martians Invaded Venus Using X-ray Guns. 尝试用可以帮助记忆的口诀，像是首字母缩略字组成的句子，例如：愤怒的火星人用X光枪入侵金星。 学习重点：
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