...I sent a e-mail to you » 发给您的电子邮件 copy density » 复制密度 on a sunday morning,i was driving down a road and saw something i couldn't believe » 在一个星期天的早晨，我被压低的道路，...
The inventioncanrealize the nondestructivecopy, extendtheoperatinglifeofthe master C. D. and selecting the largenumericalaperture to meetthe requirement for copying C. D. with high density.