limb中等

During the 1840s and 1850s, in the early days of photography, exposure times were notoriously long: the daguerreotype photographic method (producing an image on a silvered copper plate) could take several minutes to complete, resulting in blurred images as sitters shifted position or adjusted their limbs.

在19世纪40年代和50年代，即摄影的早期，曝光时间之长是出了名的：银版照相法（在镀银铜板上成像）可能需要几分钟才能完成，拍摄对象一挪动位置或调整四肢，图像就会模糊。