China is holding a knife in his right hand. China has always used the right hand, no matter from writing, holding chopsticks and knives. People's limbs are usually weaker on the left side than on the right side, so it is necessary to use the right hand more. According to biologists' research, people are accustomed to using their right hands, which is gradually formed in long-term labor. In the early Stone Age, people flocked to fight wild animals with stone axes in their hands and Shi Mao. When fighting, people instinctively bend their left hand to protect the heart on the left side of their chest, and rush to the beast with their right hand holding weapons. Gradually, the phenomenon of right-handedness has become a habit, and then it has become an innate inheritance.