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He extra polite to his superiors lest something adverse might be written into his records.
他对上级格外殷勤,生怕档案里记上对他不利的东西.
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英汉双解词典包含4367426条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。