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单词 laser pointer
释义

laser pointer

noun
A pen-shaped pointing device that contains a small diode laser that emits an intense beam of light, used to direct attention during presentations.The car did not slow down when signaled by a U.S. soldier holding a search light and laser pointer....
  • Pulses also exhibit diffraction - spreading perpendicular to their propagation direction - just as a laser pointer's beam gets wider on the way to a distant screen.
  • Also, some dogs enjoy ‘chasing’ the beam from a laser pointer.
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更新时间:2024/12/23 17:48:00