The results indicated that with the growth of the children, the strategies children used transformed from the imitation strategy and exchange strategy to the covert strategy and inversion strategy.
结果表明：随着年龄的增长，儿童使用的策略由模仿、交换向内化、相反数策略转化；
The results indicated that with the growth of the children, the strategies children used transformed from the imitation strategy and exchange strategy to the covert strategy and inversion strategy.
结果表明：随着年龄的增长，儿童使用的策略由模仿、交换向内化、相反数策略转化；
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