不明确
中文翻译：Unknown
同义词：
['BC', 'BCE', 'BCW']
例句：
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1. The ancient city of Rome was founded over 2,000 years ago.
罗马古城市建于2000多年前。
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2. The book was published in the year AD 45.
这本书是在公元45年出版的。
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3. Before the invention of the printing press, books were written on parchment and copied by hand.
在印刷术发明之前，书籍是用羊皮纸书写并手工复制的。