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"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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图⑤：贵州威宁彝族回族苗族自治县产投生态果业有限公司，工人正在自动化设备生产线上操控设备，对苹果进行清洗、测色、分级。
Москвичей предупредили о резком похолодании09:45