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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Even when the car is off and locked, these fans whir around, so when you step back into it you don't need to crank up the power-hungry air conditioning.

即使在汽车熄火及锁着的时候，这些冷却风扇也在呼呼旋转着，所以当你回到车内时，你无需开大耗电的空调。

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The price seems high, but RVs are really expensive, and back-up power will just be one more option that Good Sam members will check off.

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At 800 feet off the ground, I did a right 90-degree crosswind turn and pulled the power way back.

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