Based on PWM technique, the energy from battery discharges return to the master tape of DC, which has the advantage transmitting energy through two directions and realizes energy callback.

采用PWM调节方式，实现了能量的双向传递，将电池放电能量回馈到直流母带，解决了电池放电能量利用这一技术难题。

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The control card may indicate that the program is on the master system tape or on CARDS.

控制卡可以指出程序是在主系统带上还是其他卡片上。

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Master: (1) A plate for a duplicating machine or small offset machine. (2) Original tape, disc, film, etc from which copies will be made.

纸版，（2）原版样：（1）复印机或小型柯式机用的印版。（2）作复制用的原版磁带，磁带，菲林等。

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Do you blokes still have that master tape with Madonna and Ozzy on it?

NPR: An '80s Story Dripping with Name-Dropping

When I finished the mix the next morning, I took the master tape to the Memphis airport and handed the box to an attendant flying up to New York.

WSJ: Anatomy of a Song: Otis Redding's '(Sittin' on) the Dock of the Bay'

Now the master tape from the interview has been released as a 70-minute feature film, which is showing for a limited two day engagement (Nov 16-17) in Washington DC and other US cities.

FORBES: The Lost Interview: Steve Jobs Tells Us What Really Matters