very low frequency electromagnetic method
极低频电磁法
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The very low frequency electromagnetic method (VLF-EM) has such advantages as portable instrument, simple method, economical and high efficiency.
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。
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