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adj.把电压升高的,递升的;升压; 英英释义: step-up[ 'stepʌp ]n.the act of increasing something同义词:increasev.increase in extent or intensity同义词:escalateintensifystep upspeed up同义词:rev upstep upmake oneself visible; take action同义词:come to the forestep forwardcome forwardstep