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Isochasm

资料来源 : pyDict

极光等频线

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Isochasm \I"so*chasm\, n. [Iso- + chasm.] (Phys. Geog.)
   A line connecting places on the earth's surface at which
   there is the same mean frequency of auroras.
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