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  1. 欧路词典|英汉-汉英词典 preoperation是什么意思_preoperation的中文解释和发音_preoperation

  2. preoperation是什么意思_preoperation的翻译_音标_读音_用法_例 …

  3. PREOPERATIVE中文(简体)翻译:剑桥词典 - Cambridge Dictionary

  4. PRE-OP中文(简体)翻译:剑桥词典 - Cambridge Dictionary

  5. Piaget's Preoperational Stage Of Cognitive Development - Simply Psychology

  6. Preoperational Stage: Definition, Examples, Activities, More - Healthline

  7. The Preoperational Stage of Cognitive Development - Verywell …

  8. preoperation - 维基词典,自由的多语言词典 - 維基詞典

  9. Preoperative Definition & Meaning - Merriam-Webster

  10. PREOPERATIVE在剑桥英语词典中的解释及翻译