Water sucks into the trachea, and the lungs are cyanotic. If you only put some water in a person's nose without letting him in, he will not cyanosis. An elephant is an example. If you observe carefully, you will It was found that when the elephant drank, he first sucked a little water with his nose (and did not suck it into his lungs), then raised his head and put the water in his nose into his mouth to drink. In the process, it just used his nose as A tool for absorbing water without using the nose as a drinking organ. This passage is to demonstrate such a point:. ['You must observe carefully.', "Elephant's nose is a tool for water.", 'Elephants like to take a little water with their nose and put it in their mouth to drink.', 'Water is drawn into the trachea and the lungs go cyanotic.']