名词
中文翻译：祖先
同义词：
['ancestor', 'predecessor', 'forebear']
例句：
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1.The ancestor of the species was discovered in the fossil record.
该物种的祖先在化石记录中被发现。
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2.The professor is a predecessor to many other researchers.
这位教授是许多其他研究者的前辈。
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3.He served as the predecessor to the current president.
他曾担任现任总统的前任。