1. Conversion of alternating to unidirectional current. 
   整流交流电转变到单向电流
2. a unidirectonal flow; a unidirectional antenna; a unidirectional approach to a problem. 
   单向流速；单向天线；解决问题的唯一方法。
3. A closed unidirectional signal path connecting input/output devices to a system. 
   连接输入输出设备到系统的一种单向封闭的信号通路。
4. In electronics, the unidirectional, pinhead electron stream generated by the cathode gun in a CRT. 
   在电子技术中，由阴极射线管（crt）中电子枪所产生的、单向细电子流。参阅crt。
5. a bronchodilator (trade name Alupent) used to treat asthma and emphysema and other lung conditions; available in oral or inhalant forms; side effects include tachycardia and shakiness. 
   用来治疗哮喘和肺气肿以及其他肺部疾病的支气管扩张剂；口服或吸入；副作用包括心跳过速和心跳不稳定。

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