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TOEFL IELTS BNC: 21313 COCA: 10762

propulsion

noun
/prəˈpʌlʃn/
/prəˈpʌlʃn/
[uncountable] (specialist)
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  1. the force that drives something forward推进;推动力
    • wind/steam/jet propulsion风力/蒸汽/喷气推进
    • The fish uses its tail fins for propulsion through the water.这种鱼用尾鳍在水中推进。
    see also propel
    Oxford Collocations DictionaryPropulsion is used before these nouns:
    • system
    See full entry
    Word Originearly 17th cent. (in the sense ‘expulsion’): from medieval Latin propulsio(n-), from Latin propellere ‘drive before (oneself)’.

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