单词	transponder
释义	transponder /tranˈspɒndə / /trɑːnˈspɒndə/ noun A device for receiving a radio signal and automatically transmitting a different signal.The line includes power supplies, transmitters, optical amplifiers, digital transponders, return-path receivers, fiber-node platforms and Ethernet access devices.... The transponder transmits this coded signal using the tuned circuit. They captured these recruits as they left the hive, attached a radar transponder to them and then tracked their flight paths using harmonic radar. Origin 1940s: blend of transmit and respond, + -er1.
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