biological parent

The US State Department says a child born outside the USA to an American cannot receive citizenship until a biological link with at least one parent is established.

美国国务院称，美国人在美国境外生下的小孩不能获得美国国籍，除非父母亲至少其中一位和孩子确定存在血缘关系。

A biological birth parent search.

找一条狗的亲生父母。

Chemical modification of protein, as an effective way to improve the physicochemical and biological characteristics of the parent protein, has attracted much research and development interest.

蛋白质的化学修饰作为改善蛋白质的物理化学和生物学特性的有效手段，已经得到了越来越多的研究和开发。

You may be his biological parent, jack, but you will never be a father to ethan.

也许你是他的生父，杰克，但你永远不会是伊森的父亲