According to the law of conservation and transformation of energy: "Energy is neither created nor destroyed, it can only be converted from one form to another or transferred from one object to another."

Instrinsic meanings of 'sustainability' in 'circulation':

-Evolution: The change in the genetic characteristics of a biological population over successive generations.

-Genetic.

-Variability, mutation: 'sustainability' itself contains 'variability', so it means 'probability'.

-Conservation the change of form, energy

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