在发热材料内其运动方向与材料表面成其它任何角度的光子在碰到表面时都会被反弹回来。
Photons travelling at any other angle within the material are reflected back inside when they reach the surface.
吸引力强时，金属片朝向电磁铁运动。吸引力弱时，金属片从电磁铁处弹回。
When the pull is strong, the disc is moved toward the electromagnet, and when the pull is weak, the disc springs away from the electromagnet.
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