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机译:
Zhejiang Univ, Coll Informat Sci & Elect Engn, Hangzhou 310027, Zhejiang, Peoples R China;
China Res Inst Radiowave Propagat, Qingdao Res Ctr, Qingdao 266071, Shandong, Peoples R China;
Anisotropic ionosphere; near-field; very low frequency (VLF) electromagnetic wave;