回复st dude
作者信息
发贴信息
正文
> st dude wrote: >I guess you may need a 50 mp or so digital camera. But I am not sure if my guess is correct. > >Suppose 100 ppi big screen is clear enough for our eyes. Your 100 inches projector screen is about the size 60x80 (100^2 = 60^2 + 80^2). So >vertical: 100 x 60...
用两个手指一起，可以上下滑动文本编辑区。