motion detector

名词 n.
中文释义

英文释义

名词 n.
  1. A device used in security systems that can alert the user of the presence of a moving object.
    — Higman and his sidekick, a geophysical engineering student named Krishna Divakarla from the Colorado School of Mines, are the volunteer cavalry. They are planting homemade motion detectors on the quivering slopes.

词形变化

motion detectors plural
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