Doctor Wang took out a real pet crayfish. He soon discovered that the first mate had experienced dangers at sea earlier and did not dare to go to sea again, so he could only place his feelings on the crayfish.After communicating, he found that the first mate was afraid of the waves on the sea, so he was unwilling to let the crayfish go to the sea.Dr. Wang pretended to be the captain and staged a thrilling journey with the first mate, which finally made the first mate face his inner knot and let the crayfish see the world.