Snails and turtles

A snail was resting on the side of the road when suddenly the flood swept it away and drowned it. The snail finally caught a straw to avoid being washed away. Snail is going to live somewhere else.

A tortoise idled around and said in the scorching sun, "Alas! If only there were a big pond for me to swim in now. "

The snail came face to face and just heard what the tortoise said. The snail said, "There was a large piece of water by the roadside, which almost drowned me.". You should have enough swimming. "

The tortoise said happily, "Really? Then take me quickly. "

The snail said, "But I will be drowned."

The tortoise said, "You can ride on my back, so you can't."

The snail brought the tortoise to the flood that almost drowned him, but the tortoise only saw a small ditch, and even his own body could not hold it. Where does the snail know that the Wang Yang sea in his eyes is a small ditch that even the tortoise can't hold?