The little snail asked her mother: Why do we have to bear this hard and heavy shell when we are born?
Mum: Because our body has no bone support, we can only climb and climb fast. So want the protection of this shell!
Small snail: The caterpillar has no bones and can't climb fast. Why doesn't she have to carry this hard and heavy shell?
Mom: Because the caterpillar can turn into a butterfly, the sky will protect her.
Little snail: But my younger brother doesn't have bones to climb fast, and won't turn into a butterfly. What does he not carry this hard and heavy shell?
Mom: Because the younger brother will drill the earth, the earth will protect him.
The little snail cried: We are so poor, the sky is not protected, and the earth is not protected.
The snail mother comforted him: "So we have shells!"
We don't rely on the sky, we don't rely on the ground, we rely on ourselves.
2. Sharks and fish
Someone has experimented with placing one of the fiercest sharks and a group of tropical fis