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Fels n -en, -en
environ.	岩石 (组成地壳的矿石的集合。它可能是松散的，例如沙子、沾土和泥土，或者是坚固的，例如花岗岩、石灰石、或煤。)
German thesaurus
FEL abbr.
abbr., phys.	Feldeffektlaser; Freie-Elektronen-Laser