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Cannot be manufactured
Use the consumable pencil and tape as metaphors for the resources of the animal and plant consumed enormously by people on the earth. However, the resources of the nature in the world cannot be manufactured by human beings again. They are not inexhaustible. If human beings do not consider such a problem cautiously, then they will eventually boomerang.
Chienkuo Technology University
WU YI-JHIH WU YI-YUN