there is an ancient invention still used in some parts of the world today that allow people to seethrough wall.what is it?
来源：学生作业帮助网 编辑：作业帮 时间：2024/08/29 07:03:34
xŐN@_e 4,ծI6;`PIT0^ePx$o5d2?d 7rC)= 9 (ö
y,-%\c>h'ij-`2um20m"H@b9r^_ifYcK~冴1 2QaٝJ?)ULTdpy|#~ͣ 峎dcBd,Xd0d ٌ/*RÅc1%Ƨ̪QSYq_ak:{M^k[Z>v,yɲXw5F^j