当把磁场聚焦在大脑的的视觉皮质上时，会促使受试者看见明亮的圆盘和线条。
Focusing magnetic fields on the visual cortex of the brain caused the subjects to see luminous discs and lines.
线条交叉的点就是你聚焦的最佳点。
The points where those lines cross are ideal places to put your subject.
只有在近轴光线条件下，平行光通过凸透镜才可近似聚焦于一点。
The parallel light rays of the prnicipal axis that approach a convex lens can converge to the focal point.
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