The 2-Minute Rule for photograph
如果单击某个图像，那么整个页面会变暗，同时一个方框出现在页面中间，显示放大后的所选图片。Niépce solved this issue by coating a pewter plate with, primarily, asphalt, which grew tougher when exposed to mild. By washing the plate with lavender oil, he was ready to fix the hardened material forever to the pl