“class B push-pull sound track”的概念、定义、翻译、参考文献-科学参考

单词	class B push-pull sound track
释义	class B push-pull sound track [´klas `bē ¦pu̇sh ¦pu̇l `sau̇n ´trak] ^{ENGINEERING ACOUSTICS} Two photographic sound tracks side by side, one of which carries the positive half of the signal only, and the other the negative half; during the inoperative half-cycle, each track transmits little or no light.
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