Its main characteristic is simple, portable, fast and secure.
它的主要特点是：简单、可移植、速度快及安全。
The advantages of VLF-EM method are portable, simple, economic and efficient.
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.
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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