retardation [i r&:tZ:Rd3i.qn ]    (¼øÀ§: 14953 - ´ëÁ¹ ¼öÁØ)  
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Mean The act or process of retarding.
¿¹¹® 1. acceleration and retardation (°¡¼Ó°ú °¨¼Ó)
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