External representation plays an important role in learning from worked-out example.
外部表征在样例学习中发生着非常重要的影响。
Based on actual learning, this research had studied primary students' learning about rules of arithmetic operation by worked-example learning.
本研究立足于学习实际，对小学生通过样例学习运算规则进行了实验研究。
The non-complete worked-example learning effects of different difficult rules of arithmetic operation were different;
用不完整样例学习难度不同的规则，其效果不同；
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