输入信号的频率只有位于噪声能量集中的低频区域，才有可能使输入信号被适量的噪声选择而产生随机共振现象。
Only the frequency of the input signal locates in the low frequency region, can the signal be selected by a proper noise level to produce SR phenomenon.
换句话说，为使长期的自然选择规律发挥作用，必须依赖包含噪声的环境提供触发机制。
In other words, environment containing noise has to be relied on to furnish the triggering mechanism on which the long-term selection rule will operate.
志愿者选择不同音量的喇叭向研究人员发出爆破般的噪声，可选音量在十分贝到震耳欲聋的130分贝之间。
Volunteers chose between horn sounds that blasted noise at the students of varying volumes varying from 10 decibels to a deafening 130 decibels.
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