[化] 前级泵

backing pump的用法和样例：

例句

The pump exhaust should lead to the open air or a fume hood.抽气泵的排气管应该导向室外空旷处或导向一座通风橱。

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英语每日一词

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跟艾米莉一起学口语

AP 2012-02-06

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美联社新闻一分钟2012(二月)

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By Melinda Smith Washington 28 March 2008 Last month we told you about a young woman in the United States who got an experimental heart pump to help keep her alive. VOA's Melinda Smith has an update on her remarkable story.

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VOA标准英语2010年(四)月

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学英语单词

Actinodon

advanced communication system

airborne alert aircraft

anchor(type) mixer

association of industry and commerce

astragalus glycyphylloss