名词
中文翻译：父母行线
同义词：
['parental line', 'paternal line', 'maternal line']
例句：
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1. The parent line is the line of descent from a person's father or mother.
父母行线是一个人从父亲或母亲那里继承的血统线。
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2. In genetics, the parent line refers to the lineage of an organism's parents.
在遗传学中，父系线指的是一个生物体的父母血统。
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3. The parent line is crucial for understanding the history and development of a species.
父系线对于理解一个物种的历史和演变至关重要。