在大型电力系统中存在有自生的甚低频系统振荡。

In large interconnected power system, there have been spontaneous system oscillations at very low frequencies.

简要叙述了甚低频电磁法的方法技术，并以山城金矿为例。

This paper briefly discusses the very low frequency (VLF) electromagnetic technique and takes Shancheng gold mine for example.

我们可通过自适应算术编码压缩来提高甚低频通信系统的数据传输率。

We expect to increase the throughput by arithmetic coding adaptive data compression technique.

甚低频电磁法(VLF - EM)，具有仪器轻便、方法简单、经济高效等优点。

The advantages of VLF-EM method are portable, simple, economic and efficient.