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英语词典包含135693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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proton protonema protonemal protonematal protonic
protonotary protonotary protonotary apostolic proton-proton chain proton pump inhibitor
proton synchrotron proto-oncogene protopathic protopathy protoplanet
protoplanetary disk protoplasm protoplasmal protoplasmatic protoplasmic
protoplast protoplastic protoporphyrin protostar protostele

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