单词	radar beacon
释义	radar beacon noun : a radar transmitter that upon receiving a radar signal emits a signal which reinforces the normal reflected signal or which introduces a code into the reflected signal especially for identification purposes Word History First Known Use 1945, in the meaning defined above
随便看	rubrofugal rubropetal rubs rubs along rubs elbows rubs elbows (with) rubs elbows with rubs in rubs off rubs out rubs the wrong way rubs up rubstone rubstones rubus rubuses rubusses ruby ruby blende ruby copper ruby copper ore ruby fly ruby glass ruby grass ruby laser

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