Helps students from low to high, progressively, from simple to complex and gradual mastery of knowledge, enabling students logical reasoning ability, thinking ability, ability to judge, a comprehensive analysis of problems and emotional nurturing.

Students benefit from low to high, from shallow to deep, from simple to complex, step by step, enabling students to knowledge of logical reasoning ability, thinking ability, judgment, the integrated ability to analyze issues and emotional nurturing.

The advantageous student from lowers high, from the shallow to the deep to, from simply to complex gradually grasps the knowledge, raises student's logic reasoning ability, the power of thought, judgment ability, generalized analysis question ability and emotion gradually influencing advantageously.

Enabling students from low to high, easy-to-digest, from simple to complex and gradual knowledge, conducive to developing students ' logical reasoning ability, thinking, judgment, comprehensive analysis of issues, and influence of emotions.

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