你可以将正后像视为拨动后琴弦的振动。弹琴者手指离开了琴,而琴音依旧。因为琴弦上的能量需要点时间消退。
Its a similar situation with your eyes. In order to respond usefully to such a relatively faintsignal as light, the cells in the retina need to be very sensitive. Over-stimulate them and some will continue responding for a couple of seconds after the stimulus is removed.
视觉的情况也类似,视网膜细胞的感光十分敏感以便及时感知像光线般微弱的信号。受到过度刺激的视网膜细胞,部分在刺激后持续反应。
Of course, the only thing we ever see, really, is the activation of our retinal cells thats what our brains interpret as light from the outside world. So for as long as it takes for them to calm down, you will continue to see a faint glow of light even though nothing is there.
当然,唯一我们看到的是视网膜细胞的激活也就是大脑解读的:外界的光线。所以,只要刺激后需要时间平复,你就能持续看到微弱的灯光,虽然,实际上并不存在。
【英语六级听力练习之残余的光线 Afterglow】相关文章:
最新
2017-01-16
2016-10-21
2016-10-08
2016-10-08
2016-10-08
2016-10-08