"For a long time, roboticists have used DC [direct current] motors to make robots move," says Mike Tolley at the University of California San Diego.
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“初めて・最・変化・危機” 転換点迎えたオリンピック
“尝鲜”明黄色的门头不大，挂着新年装饰品。 南方周末记者贾梦雅｜摄