The third kind of work is the tortoise's suction. How does the tortoise breathe? It has no intercostal muscles and bones. Only when the head and neck are combined with the stomach can it do thoracoabdominal breathing. One of the benefits of this job is that the stomach moves, the chest moves, and the cardiovascular and cerebrovascular diseases move, so the tortoise can't have a cerebral infarction, so it has the longest life.