major coil

例句：

1. 1. The car's engine has a major coil in it that needs to be replaced.
   这辆车的引擎里有一个大线圈，需要更换。
2. 2. The engineer carefully inspected the major coils of the machine before starting the operation.
   工程师在启动操作前仔细检查了机器的主要线圈。
3. 3.The new design uses a major coil system to improve efficiency and reduce emissions.
   新设计采用了一个主要的线圈系统来提高效率和减少排放。