名词
中文翻译：Unknown
同义词：
['ancestor', 'forebear', 'ancestry例句：1. The protochordate of the family tree is the great-great-great-grandfather.（家族树的原型是曾祖父。）']
例句：
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1. The protochordate of the family tree is the great-great-great-grandfather.
家族树的原型是曾祖父。
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2.The protochordate of the city's history is the founding father.
这座城市的历史原型是创立者。
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3. The protochordate of their love story is a shared childhood.
他们爱情故事的原型是共同的童年。