“echo”的概念、定义、翻译、参考文献-科学参考

单词	echo
释义	echo [`ek·ō] ^ELECTRONICS 1. The signal reflected by a radar target, or the trace produced by this signal on the screen of the cathode-ray tube in a radar receiver. Also known as radar echo; return. 2. See <<ghost signal>> ^PHYSICS A wave packet that has been reflected or otherwise returned with sufficient delay and magnitude to be perceived as a signal distinct from that directly transmitted.
随便看	epiclastic epicnemial epicondyle epicondylitis epicone epicontinental epicontinental sea epicotyl epicranium epicuticle epicycle epicyclic gear epicyclic train epicycloid epicyst epidemic epidemic diarrhea of the newborn epidemic encephalitis epidemic gastroenteritis epidemic hepatitis epidemic jaundice epidemic keratoconjunctivitis epidemic neuromyasthenia epidemic pleurodynia epidemic roseola

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