母系的英文：
maternal

Tracing descent from either the paternal or the maternal line only.
仅仅从父系或母系线索来追溯子孙后代的。

Line of descent as traced through the maternal side of a family.
母系家族（或家谱）从母亲一边追溯渊源的后代家系。

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。

Generally speaking, paternal side is closer as compare to the maternal side.
一般来说﹐父系家族比母系家族要亲得多。

Women are entitled to maternity leave.
妇女有权享有产假。

Morisot had experienced maternity herself.
莫里佐也曾为人母。

A children's,maternity,surgical ward
儿科、产科、外科病房

Line of descent as traced through the maternal side of a family.
母系家族（或家谱）从母亲一边追溯渊源的后代家系。

Trainee nurses have to work for some weeks in maternity.
受训的护士必须在产科医院工作数周。