C1790 Transfusion Technique

"All the blood in a human's body is red, yet there's actually such an emphasis." Shangguan Yujie asked curiously, "Then is it that blood types can't be transfused with each other?"

"Yes." Xiao Feier said, "People with different blood types can't transfusion each other."

"Then, how can we determine that the blood of these two people is the same?" Miao Miao asked