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.
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。
2
The problems about the selection of excitation signal, limits of measurement frequency and noise influence have been discussed.
最后还讨论了时域法测量电极阻抗的激励信号的选择、测量频率上、下极限和噪声影响等问题。
3
About the sound insulation effect, PC board is internationally recognized as the first selection of highway noise barrier material, it can even 40 decibels of sound insulation.