There is no way to differentiate among the various structures along the path, since attenuation is the total result of the tin/lead in solder, trace tinning, copper, and internal metal layers.

• 是没有办法去分辨其中的各种结构沿着路径，因为是衰减的总成果锡/铅焊料，镀锡微量元素，铜，内部金属层。