We must be handed the cognitive tools of numbers before we can consistently and easily recognize higher quantities.
我们必须掌握数字的认知工具，才能始终轻松识别更大的数量。
Chemical cognitive tools such as database of three-dimensioned molecule model and chemical experiments are urgently needed in the education of high school.
中学化学教学中迫切需要像三维分子数据库和化学实验数据库等化学认知工具。
Chemical cognitive tools such as database of three-dimensioned molecule model and chemical experiments are urgently needed in the education of high school.
中学化学教学中迫切需要像三维分子数据库和化学实验数据库等化学认知工具。
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