高分悬赏翻译，谢谢
Key word:The magnetic current changes the attenuator, the structural design method, the magnetic circuit design method
This article first chapter raises the goal which had problems and studies.
Second chapter mainly introduced the magnetic current changes the attenuator the elementary theory.
Third chapter is this article key point, the primary coverage is obtains the attenuator according to some theory material working pattern some essential data, and according to these data design attenuator structure and magnetic circuit.
The fourth chapter and basis asked some existence question also to propose some improvement question tentative plan.
go to websites to search for it.
