beam of light

基本解释

A beam of light that can pull is counterintuitive to physicists, who have spent centuries studying light’s ability to push.
由于已经花了几个世纪研究光的推动能力，物理学家们的直觉意识到会有一种光束能够拉动物体。
And Grier should know: he designed his own tractor beam and built it, demonstrating for the first time that a beam of light can tug objects over long distances.
因为他设计并制造了他自己的牵引光束装置，并且用他的装置第一次证明了光束可以远距离拖动物体。
These can be customised after surgery by playing a low-intensity beam of light onto their photosensitive material.
这些晶体可以在手术之后通过将一束低强度的光照到其光敏物质上来定制（功能）。

This intense heat they project in a parallel beam against any object they choose, by means of a polished parabolic mirror of unknown composition, much as the mirror of a lighthouse projects a beam of light.
So this gives you a little bit of an idea of just how many individual photons there are in a laser beam of light. This is a huge number of photons.
这个给你们一点思路关于,一个激光束有多少独立的光子,这是一个巨大的光子数目。
麻省理工公开课 - 化学原理课程节选
So what we end up with for the number of photons in this laser beam of light is 2.1 times 10 to the 17 photons.
这个激光束的数目是,2，1乘以10的17次方。
麻省理工公开课 - 化学原理课程节选

Is the best beam of light one by a window, or encircling a bed?
FORBES: Using A Light Barrier To Repel Mosquitoes