单词：maternal line
maternal line的用法和样例：
例句
- Everyone has two paternal grandparents and two maternal grandparents.每个人都有两个属于父系的祖父母和母系的祖父母。
- For most genes, both the maternal and paternal alleles turn on or off at the same time.Imprinting disrupts this balance.对多数基因来说，来自父系及母系的对偶基因是同时开启或关闭的，铭印则破坏了这种平衡。
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