名词
中文翻译：Unknown
同义词：
['double', 'sibling']
例句：
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1. The doppelganger is a man who looks exactly like his twin brother.
这个双生子长得和他的双胞胎兄弟一模一样。
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2. She was so happy to see her doppelganger again after years apart.
多年未见后，她很高兴能再次见到她的替身。
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3. The doppelganger had been living in the same house as the real person for years.
这个替身多年来一直住在那个人的房子里。