Natural Father shall be responsible for the total cost of all paternity testing.

生父应负责亲子鉴定的全部成本。

youdao

Baby's P's natural father, who cannot be named for legal reasons, said: "P was a bouncing 17-month-old boy.

男孩P的生父，（出于法律保护原因不能提及名字）说：“P是个健壮的十七个月大的孩子。

youdao

He was a wonderful father to both his natural and adopted children.

他对亲生的和领养的子女都很好。

《牛津词典》

On their own initiative, the children track down a man called Paul (Mark Ruffalo), their natural father.

NEWYORKER: The Kids Are All Right

Bussell was estranged from her natural father John Crittle, an Australian who left her mother when Bussell was six and who died earlier this year.

BBC: Darcey Bussell: Ballet superstar

She said she now wants the twins back but her estranged husband, Aaron Wecker - the natural father of the twins - has also applied to a court in Missouri for custody.

BBC: News Online