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CIRCLE中文(简体)翻译:剑桥词典 - Cambridge Dictionary
circle是什么意思_circle的翻译_音标_读音_用法_例句_爱词霸在线词典
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Circle -- from Wolfram MathWorld
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Circles - Formulas, Properties | What is a Circle? | Examples
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Circles – Explanation & Examples - The Story of Mathematics