副词
中文翻译：大约
同义词：
['around', 'about', 'before', 'during', 'till', 'until']
例句：
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1. We will meet at the circa 8:00 pm.
我们将在晚上八点见面。
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2. The project is expected to be completed within circa two years.
这个项目预计将在两年内完成。
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3. She arrived circa three hours after her flight.
她到达航班后三小时。