Dolphins can't breathe in water, because unlike other marine creatures, dolphins don't have gills, so they can't breathe through filtered water. Dolphins use lungs to breathe, and the auxiliary respiratory organs are nose and mouth. So they can't breathe in the water. Dolphins and their respiratory systems are similar to those of humans, but they are also somewhat different from humans, because they have larger vital capacity and can hold more air, and they can breathe for a longer time at a time. When they breathe once, they will move into the water, and when the oxygen they breathe is almost exhausted, they will jump out of the water.

As mentioned above, dolphins can't breathe in water because they breathe with their lungs. Dolphins breathe in a similar way to humans, exhaling exhaust gas through their nose and mouth, then inhaling fresh air into their bodies, and finally transporting oxygen to all parts of their bodies through their lungs. Under normal circumstances, dolphins breathe every 20-30 minutes. However, different varieties can persist for different times. But no matter how long dolphins can hold on, they need to swim to the water regularly to breathe. Therefore, many people can observe dolphins jumping out of the water every once in a while when they go out to sea.