老照片中没有人笑的原因

Looking at portrait1 photos from the past， you may notice a common trend.The old portrait photographs often show adults and children looking serious and notsmiling. This can even be seen in photos of weddings and celebrations where youexpect happiness and joy. You will mostly notice this in portraits taken in the late18th century and throughout the 19th century. But why did people not smile infront of the camera？ In this article， we will look at the history of photography andthe traditions around portraiture2.

看看过去的肖像照片，你可能会注意到一个共同的趋势。（剩余3722字）