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A second possibility, for more power-hungry devices, is to fire a finely focused infrared laser beam at a photovoltaic cell, which converts the beam back to electrical energy.

第二种可能性则能应用在更加耗电的设备上。其原理是发射一道精确聚焦的红外激光线，击中光伏电池，由此能够将光束转换回电能。

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Scientific American magazine says huge lasers turn only about twenty to thirty percent of the energy they use into a laser beam.

VOA: special.2010.09.01

It is an electron beam. In the 1890s, the latter part of the 19th century a very fashionable word was "ray."

那是个电子束，在十九世纪九十年代，就是19世纪末,一个很时髦的词汇-“光线“

麻省理工公开课 - 固态化学导论课程节选

The thousand liveried angels - begin to cast their special beam on the virgin's outward shape -- that's her body, the unpolluted temple that houses her virginal mind.

一千个穿着衣服的天使,开始在处女的身体上投射他们神奇的光束-,那就是她的身体，那个装着无暇心灵的未受污染的殿堂。

耶鲁公开课 - 弥尔顿课程节选

Now shine a tiny laser beam through the token, noting exactly where and at what angle you aimed the beam.

FORBES: Magazine Article

Raisman, the last performer on the beam, paced in front of the beam as officials reviewed video of her routine.

WSJ: Social Media

When the reflected object beam and the reference beam are recombined, they create an interference pattern that encodes the 3-D image.

ENGADGET: Infrared holography lets rescuers see people through walls, fire, walls of fire (video)