名词
中文翻译：Unknown
同义词：
['sequential', 'successive', 'continuity']
例句：
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1. Thetrain departed in a series of whistles.
火车以一系列汽笛声出发。
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2.The sequence of events unfolded gradually.
事件按序逐渐展开。
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3. The serial killer was caught after a year's investigation.
经过一年的调查，连环杀手被抓获。