I rather believe he is the natural son of some rich man.
我更相信他是某个有钱人的亲生儿子。
朗文OCLM-01单词
He was rumoured to be the natural son of a duke.
【natural,naturalness】谣传他是某位公爵的私生子。
幽谷百合(下)
Arabella's two children, who were amazingly like de Marsay (a natural son of the old lord), were near their mother; de Marsay himself was on the sofa beside her.
阿拉贝拉的两个孩子非常像德·马赛(老爵爷的亲生儿子),离他们的母亲很近。 de Marsay 本人坐在她旁边的沙发上。
红与黑(三)
" The natural son of the Emperor of Russia ... who would be made a sovereign in honour of his marriage, or quite simply the comte de Thaler, who looks like a dressed-up peasant" .
Legitimacy, in Western common law, is the status of a child born to parents who are legally married to each other; and of a child conceived before the parents obtain a legal divorce. Conversely, illegitimacy (or bastardy) is the status of a child born outside marriage.