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echo delay time造句

"echo delay time"是什么意思   

例句與造句

  1. Variations in the echo delay times of radio transmissions, known as long delayed echoes, or LDEs, have also been interpreted in Professor Bracewell's 1960 paper as evidence for such probes.
  2. It's difficult to find echo delay time in a sentence. 用echo delay time造句挺難的

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