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1. Oxford Dictionary

   ozone depletion

   • n.
     reduction in the concentration of ozone in the ozone layer

   • noun: ozone depletion

2. • 釋義

   n.

   名詞

   • 1. reduction in the concentration of ozone in the ozone layer this chemical contributes to ozone depletion
3. • 更多解釋

   ozone depletion

   • n.
     reduction in the concentration of ozone in the ozone layer: this chemical contributes to ozone depletion

   Oxford American Dictionary