单词	sporadic E layer
释义	sporadic E layer noun : a layer of ionization occurring irregularly within the E region of the ionosphere Word History First Known Use 1949, in the meaning defined above
随便看	heliptera Helipterum helipterums helis heliskiers Helisoma helistops helium helium group helium I helium II helium-3 helium-4 heliums helix helix angle helixes helixin helixometer hell hell bomb hell driver hell driving Hell Gate hell of a

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