And that equals the magnetic permeability of free space times the current inside the Amperian loop, which I don't really know how to define.

这等于自由空间的磁导率乘以安培环内的电流，我真的不知道如何定义。

That means the magnetic field inside an ideal solenoid equals the magnetic permeability of free space times the turn density of the solenoid times the current through the insulated wire of the solenoid.

这意味着理想螺线管内部的磁场等于自由空间的磁导率乘以螺线管的匝密度乘以通过螺线管绝缘线的电流。

And that means the magnetic field inside the solenoid equals the magnetic permeability of free space times the number of turns inside the Amperian loop times current in the wire all divided by the length of the Amperian loop.

这意味着螺线管内部的磁场等于自由空间的磁导率乘以安培环路内部的匝数乘以导线中的电流，然后再除以安培环路的长度。