However, traditional power back off method owns poor efficiency and is limited by electronic devices.

传统的功率回退应用方法存在器件及效率方面的限制。

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Contour modulation is a technique in which a phase-modulated signal waveform and amplifier output impedance work together to maintain higher efficiency over a sizable output power back-off.

轮廓调制结合了一种相位调制信号的波形和放大器的输出阻抗，可在某个较大型输出电源关闭后保持更高的效率。

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To pump energy back into the grid, some of the rotational energy is bled off to power a generator on the main shaft.

把电能又送回电网时，就释放一部分转动的动能，开动位于主轴的发电机。

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So unless it is prepared to let power shortages continue restricting growth, Brazil may be better off switching back towards a free market, difficult though it may be to get right.

ECONOMIST: Brazil's energy crisis

Far from assuming that the swing of the pendulum will in good time carry the Tories inexorably back to power, some of his party's leaders have privately written off their chances of victory in the next election.

ECONOMIST: America��s spring of vigour

With PS4, gamers just hit the power button again and are promptly back playing the game at the exact point where they left off.

ENGADGET: Sony details PlayStation 4 specs: 8-core AMD 'Jaguar' CPU, 6X Blu-ray