There is a Little Snail(蜗牛) in the forest. Spring is coming. Little Snail is taking a walk in the forest. A mouse sees him. He thinks Little Snail is going for a trip(旅行). A frog jumps out and thinks Little Snail is the postman. They both think the shell(壳)on Little Snail's back is a big bag. In fact(实际上),the shell is Little Snail's home. Then it rains. All the other animals look for shelter(遮蔽). Little Snail just draws(拉动) himself into the shell and it keeps him safe and warm.
—No. It's his .
—Because it keeps him .
—He lives in .