At first, the tortoise was a one-toed fish, such as "the tortoise with a thousand years". Later, people found the middle word "Wang" and two characters "Eight" on the texture of the tortoise's bellybutton, so the tortoise also refers to the tortoise, which is also a widely circulated swear word, and at the same time a lot of swear words have been extended.

Introduction to tortoise

Soft-shelled turtle is a common name for soft aquatic soft-shelled turtle of Trionyceae. Also called tuanyu, water fish, etc. Some places in the south are called Tanyu and Jiayu. The turtle's head looks like a turtle, but its carapace has no stripes, and its edge has a soft skirt, and its shell is softer than the turtle's. The shape is oval, which is flatter than that of a turtle. A soft outer membrane is attached to the dorsal abdominal nail, and there is a delicate skirt around it. The head, neck and limbs can be stretched, and each limb has five claws. Judging from the appearance and color, turtles usually have dark green backs and limbs, and some have light brown backs and red bellies.