Guan Yu said, "This crossbow is a common weapon in my hometown. Its function is better than bow and arrow, but its strength and speed are much stronger than bow and arrow. It is especially suitable for use as a dark weapon. It is very lethal to shoot an arrow without the knowledge of the enemy."

"I understand the above quota principle, I can only say fantastic, it seems very difficult, but I am very willing to try, as long as you provide me with the next technical venues and materials, I am willing to continue to try to make, until this thing is successful, but the prerequisite, do not...