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In the living environment the construction has noise Influence people's quality of life an Absorb noise Guardrail can reduce the noise The voice spreads by the air. We refract by the caltrop to reduce the noise Create a better quality of life we use the environmental protection absorbs sound wood Let a discarding of workplace recall wood and use for engineering at the feedback .
Zie-Jie Lai Jui-Ta Hsu Meng-Jie Li