ballast layer

例句：

1. 1.The new design of the transformer has a more compact ballast layer.
   变压器的新设计具有更紧凑的铁芯层。
2. 2. The engineer carefully inspected the ballast layer to ensure its integrity.
   工程师仔细检查了铁芯层以确保其完整性。
3. 3. The ballast layer plays a crucial role in maintaining the stability of the electrical system.
   铁芯层在维持电气系统稳定性方面起着至关重要的作用。