“push-to-talk circuit”的概念、定义、翻译、参考文献-科学参考

单词	push-to-talk circuit
释义	push-to-talk circuit [`pu̇sh tǝ `tȯlk ´sǝr·kǝt] ^ELECTRICITY Simplex circuit in which changeover from the receive to transmit state is accomplished by depressing a single spring- return switch, and releasing the switch returns the circuit to the receive state; the push-to-talk switch is located on microphones and telephone handsets; it is most often applied to radio circuits.
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