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英语词典包含147115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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surveillance activities surveillance aircraft surveillance capability surveillance device surveillance drone
surveillance equipment surveillance footage surveillance gear surveillance helicopter surveillance mission
surveillance operation surveillance plane surveillance programme surveillance system surveillance tape
surveillance technique surveillance technology surveillance tool surveillance unit survey
survey an area survey a site survey concludes survey data survey design

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