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absolute permissive block in a sentence

"absolute permissive block" in Chinese  
  1. Many western railroads used an automatic system called absolute permissive block ( APB ), where trains entering a stretch of single track would cause all of the opposing signals between there and the next passing point to " tumble down " to a Stop position thus preventing opposing trains from entering.
  2. It's difficult to find absolute permissive block in a sentence.

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