The team has found previously unidentified factors that help a bike stay upright and has developed a slew of unusual designs that wouldn't have been thought to be stable.
The widely accepted "set-point" theory of happiness says that an individual's long-term happiness tends to be stable because it depends mainly on genetic factors.
Gradually improved the Clinical Symptoms and basically stable the Disease. In this situation, just avoid the interference of Inectious Factors, the Disease will not repeat.