C131 Four-dimensional Color Ultrasound

Sunday was a good day. The sun was shining brightly, and the snow on the roof and the flowers were shining brightly. The old man often said that the snow didn't turn cold, so even though there was plenty of sunlight, he couldn't feel any warmth when it shone on people.

Guo Jingjing was going to the hospital to take a four-dimensional photo today. After studying about this last night