单词：foldback
foldback的用法和样例：
词汇搭配
- foldback sequence回折顺序, 反向重复...
- foldback circuit返送电路,监听线路...
- foldback loudspeaker返送扬声器
- foldback DNA折回DNA
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flow vi.流，流动 flower n.花，花卉；开花 flu n.流行性感冒 fluctuate vi.波动 vt.使波动 fluent a.流利的，流畅的 fluid n.流体，液体 flush n.兴奋，脸红；发烧 flute
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与数字有关的英语词根总结 milli-【千分之一】例：milliampere（毫安）=milli（千）+ampere（安培） centi【百分之一】例：centimeter（厘米）=centi（百分之一）+meter（米） deci【十分之一】例：decibe
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