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十二生肖的来历
从子鼠到亥猪，用一轮卡片记住十二生肖竞渡传说。
LanguageEveryday English
High-frequency words with compact meanings, examples, and distinctions.
ScienceCommon Chemical Formulas
Essential formulas, names, structure notes, and everyday uses.
DesignPrinciples of Good Design
A practical vocabulary for hierarchy, rhythm, contrast, and restraint.
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