For the system with only positive feedback, we find there is a kind of relationship between the bistability and the effect of the stimulus.
对于仅有正反馈的系统，我们发现其产生可逆性与不可逆性双稳与外部激励作用的方式有着密切的关系。
The symbiotic relationship between carp fish as well as amphibians that live in rice paddies create positive feedback loops.
鲤鱼和生活在水田里的两栖动物间的共生关系形成了正向的反馈回路。
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