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1. Oxford Dictionary

   depletion

   • IPA[dɪˈpliːʃn]

   英式

   • n.
     reduction in the number or quantity of something

   • noun: depletion, plural noun: depletions

2. • 釋義

   n.

   名詞

   • 1. reduction in the number or quantity of something the depletion of the ozone layer