C421 Two methods

Meng Wuzhen continued to explain: "There are two ways to transfer viruses. The first way is to transfer Yin and Yang, the second way is to transfer blood."

"Yin-Yang Transfer Technique?" Blood Transfer Method? " Xiong Yu faintly understood the meaning of the two methods, but he was not sure, and asked: "I ask Grandpa Meng to enlighten me."

Meng Wuzhen explained