Heating the artificial muscles with an electric current causes them to compress the softcenter of the pump, forcing urine through an outlet that pumps it up to the height of the robot's fuel cells.
加热该人造肌肉与电流使它们压缩泵的软中心，迫使尿通过泵它的出口到机器人的燃料电池的高度。
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“Hard on the outside, with a soft chewy center, ” is the way many veteran computer security researchers think of such strategies.
许多资深的计算机安全研究人员认为这种战略是“外硬内软”。
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Source: U.S. Food and Drug Administration, National Soft Drink Association, Center for Science in the Public Interest.