| 单词 | harmonic selective ringing |
| 释义 | harmonic selective ringing [här`män·ik si¦lek·tiv `riŋ·iŋ] COMMUNICATIONS Selective ringing which employs currents of several frequencies and ringers, each tuned mechanically or electrically to the frequency of one of the ringing currents, so that only the desired ringer responds. |
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