"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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辨认应当制作辨认笔录，由人民警察和辨认人签名、盖章或者按指印。
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"Do it slowly, do it right but let's get on with it," she said. "We have been stagnating at these very low recycling rates for far too long."