Through our country, the United States, Canada, comparison of the three materials-based analysis of the basic concepts primary school science and basic principles of composition.
通过对我国、美国、加拿大三国教材的比较，分析小学科学教材的基本概念和基本原理的构成。
Through our country, the United States, Canada, comparison of the three materials-based analysis of the basic concepts primary school science and basic principles of composition.
通过对我国、美国、加拿大三国教材的比较，分析小学科学教材的基本概念和基本原理的构成。
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