“round-the-world echo”的概念、定义、翻译、参考文献-科学参考

单词	round-the-world echo
释义	round-the-world echo [`rau̇nd thǝ `wǝrld `ek·ō] ^{COMMUNICATIONS} A signal occurring every ¹/₇ second when a radio wave repeatedly encircles the earth at its speed of 186,000 miles (300,000 kilometers) per second.
随便看	zenith zenithal chart zenithal hourly rate zenithal rain zenith angle zenith distance zenith telescope zenocentric coordinates zenodiagnosis zenographic coordinates Zeno's paradox Zeoidea zeolite zeolite catalyst zeolite facies zeolitization Zeomorphi zeotrope zephyr Zepp antenna Zerewitinoff reagent zero zero-access instruction zero-access storage zero-address instruction format

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