1. current through primary coil induces current in secondary coil. 
   通过原线圈在次级线圈中产生电流。
2. A coil or loop. 
   一圈或一卷
3. To coil or curl. 
   盘绕或卷曲
4. To roll together; coil up. 
   缠绕使…卷曲起来；使…盘绕
5. Coil the rope up, please. 
   请把绳子盘起来。

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