查词历史：
- blue book blue blood
n.
- 复数： blue books
- 易混淆的单词：Blue Book
- Noun
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1. a report published by the British government; bound in blue
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2. a register of persons who are socially prominent
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3. a blue-covered booklet used in universities for writing examinations
- 1. The book's cover has white lettering on a blue background.
- 本书封面为蓝底白字。
来自《简明英汉词典》
