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1. Oxford Dictionary

   energy conservation

   • n.
     the prevention of the wasteful use of energy, especially in order to ensure its continuing availability；the principle by which the total energy remains constant in a system that is not subject to external influence.

   • noun: energy conservation

2. • 釋義

   n.

   名詞

   • 1. the prevention of the wasteful use of energy, especially in order to ensure its continuing availability the houses are designed with energy conservation and low maintenance costs firmly in mind a conscious decision to promote renewable fuels and energy conservation
   • 2. the principle by which the total energy remains constant in a system that is not subject to external influence.