1. a step-up transformer with an air core; used to produce high voltages at high frequencies. 
   有一个空气中心的升压器；常用来在高频率中产生高电压。
2. economic operation of transformer 
   变压器经济运行
3. inrush current of transformer 
   变压器涌流
4. His pulse was so weak that the doctor gave him up for dead. 
   他的脉搏是这样微弱，大夫以为他已经死了。
5. The nurse entered up the temperature, blood pressure and pulse rate of the patient. 
   护士记下了病人的体温，血压和脉搏次数。

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