Bistability can only arise in biological and chemical systems if three necessary conditions are fulfilled: positive feedback, a mechanism to filter out small stimuli and a mechanism to prevent increase without bound.
在生物和化学系统中，只要满足三个条件，就能够产生双稳态现象：正反馈、过滤小刺激信号的机制和防止无约束增长的机制。