solid iron core

例句：

1. 1. The solid iron core is thekey to the machine's operation.
   固体铁心是机器运行的关键。
2. 2. The engineerdesigned a solid iron core for the newgenerator.
   工程师为新发电机设计了一个固体铁心。
3. 3. The solid iron core helps toreduce vibration and noise in the system.
   固体铁心有助于减少系统中的振动和噪音。