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英语词典包含243303条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。

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observationally observation-based observation basis observation car observation cell
observation deck observation mine observation post observation report observation satellite
observation sentence observation statement observation term observation ward observative
observator observatory observe observedly observer
observership observer's paradox obsess obsession obsessional

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