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servo

noun
🔊/ˈsɜːvəʊ/
🔊/ˈsɜːrvəʊ/
(plural servos)
(specialist)
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  1. a part of a machine that controls a larger machine（机器的）伺服系统，随动系统Topics Engineeringc2
    Word Originlate 19th cent.: from Latin servus ‘slave’.