通信中Frequency block是什么意思

Frequency block
频率块
双语对照

例句:
1.
Conclusion: blocking effect of high frequency ac signal to nerve action potentialconduction can potentially provide new methods for clinical applications of electricalnerve block in local anesthesia, acesodyne and spasmolysis.
结论:高频电刺激对神经动作电位阻断作用为临床局麻?镇痛和解痉探索提供了新的依据?

2.
In a number of recent cases, urban residents have managed to block theconstruction of chemical plants near their homes, while in rural areas and moreremote cities the frequency of full-scale riots and violent demonstrations has spikedin recent years.
在近来发生的诸多案件中，城市居民成功阻止了政府在自家附近建造化工厂，而在农村地区和更偏远的城市，爆发大规模骚乱和暴力示威的频率近年来急剧上升。