focus coil

例句：

1. 1.The new focus coil system greatly improves the accuracy of the measurement device.
   新的聚焦线圈系统极大地提高了测量设备的精度。
2. 2. The engineer used a special focus coil to achieve high-resolution imaging.
   工程师使用一种特殊的聚焦线圈实现了高分辨率成像。
3. 3.The focus coil is crucial for maintaining stable magnetic fields in the magnetron.
   聚焦线圈对于维持磁控管中的稳定磁场至关重要。