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photoelectric eye in a sentence

"photoelectric eye" in Chinese  
  1. Photoelectric eyes measure the amount of sun coming into the space and increase or decrease the fluorescent lighting to balance the light levels in the office.
  2. Under U . S . federal law ( UL 325 ), garage door openers manufactured for the U . S . since 1993 must include a secondary safety reversing system, such as photoelectric eyes or sensors, mounted no higher than six inches above the ground, or an electric safety edge mounted on the bottom of the door, which upon contact reverses with about 15 pounds of pressure.
  3. It's difficult to find photoelectric eye in a sentence.

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