Chu Ying asked the three people to guard the entrance of the cabin in front of the sharks in the waves. She took Uncle Fu to read back to her cabin. Carefully took out two small black balls from the box, which were as big as half a man's palm.
Uncle Fu looked at the two black balls and asked, "Master, what are these?"
"It has the same function as a grenade, but its power is many times larger than a grenade."
After saying this, Chu Ying taught Uncle Fu how to use it: "Tear off this bracelet and throw it out again."
Uncle Fu has been exposed to various weapons and used grenades: "Master, you are