2007-07-25 When Eye Problems Involve Diseases of the Retina
This is the VOA Special English Health Report. The retina is the sensory tissue in the back part of the eye. It gathers light and captures images from the lens,…
VOA英语教学网 - VOA LEARNING ENGLISH
一个让你免费在线学习VOA英语的好地方! 无须报名, 不收学费, 全年无休, 保证提高! (^_^)
This is the VOA Special English Health Report. The retina is the sensory tissue in the back part of the eye. It gathers light and captures images from the lens,…