Because a longer time for the radar pulse to return would imply a greater distance, the Controller would then make adjustments based on an incorrectly estimated position.

所返回的雷达脉冲时间较长就意味着更远的距离，Controller随后将根据不正确的估计位置作出调整。

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From the return pulse, LOLA determines the time of flight which, accounting for the speed of light, reveals the distance from the spacecraft to the lunar surface.

之后激光高度计将参照光速，计算出反射脉冲的渡越时间，从而获得飞船与月球表面之间的距离。

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"The idea is that the time that the pulse is on is about a quarter of a period of a vibration, " Sankey said.

桑基解释：“办法就是在四分之一的震动周期中施加脉冲，就像推小孩儿荡秋千一样，一个脉冲推动一次”。

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What's particularly "astonishing" he says, is how precisely the baby responds - in coos and gestures - often exactly in time with the pulse and bar structure of her sounds.

BBC: The universal language of lullabies

Since the FDA gave the big thumbs up to a fully implantable artificial heart earlier this month, cardiac surgeon "Bud" Frazier and his team at the Texas Heart Institute aren't wasting any time in developing what they hope will be a fully-functioning, pulse-free artificial heart.

ENGADGET: HeartMate II: the pulse-free artificial heart

By the time paramedics rushed the 32-year-old to the hospital, doctors could not find a pulse.

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