单词	preoperational
释义	preoperational adjective pre·​op·​er·​a·​tion·​al ˌprē-ˌä-pə-ˈrā-shnəl  -shə-nᵊl variants or pre-operational psychology : of, relating to, or being the stage of cognitive development according to Jean Piaget's theory in which thought is egocentric and intuitive and not yet logical or capable of performing mental tasks Piaget believed that during the preschool period and up to about age 6 or 7, children are in a preoperational stage—too young to perform mental operations. David G. Myers The preoperational child will invariably point to the taller, thinner glass. He believes that it contains more water because the water level is higher. Dorothy G. Singer & Tracey A. Revenson Word History First Known Use 1951, in the meaning defined above
随便看	scored off scorekeeper scorekeepers scoreless scorelines scorepad scorepads scorer scorers scores scores off Scoresby Sound scoresheets scorest scoria scoriac scoriaceous scoriae scorification scorifications scorified scorifier scorifiers scorifies scoriform

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