What stories do the three golden statues tell?

One day, the king received three golden statues from neighboring countries. These three golden statues look exactly the same, but the king of the neighboring country said that their values are completely different and asked him to distinguish them. The king and his ministers looked around the golden statue, but they didn't find any difference. The king was afraid of not being able to eat and being laughed at by his neighbors.

A young man in this country was put in prison for quarreling with his rich neighbor. Knowing this, he asked the king to let him try. The king had no choice but to be taken to the palace.

The young man looked at the three golden statues carefully and found an eye hole drilled in each ear, so he took a straw and put it in one by one. The first straw comes out of the mouth, the second straw comes out of the other ear hole, and the third straw can't get out of the stomach. So he said to the king, "Say what you hear first, you can't rely on it, it's worthless;" The second one goes in one ear and out the other, unlearned and worthless; The third put what he heard into his stomach. He is literate, knowledgeable and the most valuable! "

The young man guessed the riddle of the neighboring king, and the king was very happy. He left him in the palace and asked him for advice.