birth + [parent]
birth 用在 parent、mother、father 等词前，表示因分娩而有血缘关系的，不能单独作表语。
She decided to contact her birth father.
她决定联系她的生父。
由分娩建立的家庭关系
Of a familial relationship: established biologically by birth, rather than by adoption or marriage.
仅用于名词前，常构成 birth mother（生母）、birth parents（亲生父母）等表达。
由分娩建立的家庭关系
A familial relationship established by childbirth.
She decided to search for her birth parents.
她决定寻找她的亲生父母。
用法提示：birth 作定语形容词，修饰 parents，表示“有血缘关系的、亲生的”。
He was raised by his birth mother until he was five.
他五岁之前由他的亲生母亲抚养。
用法提示：birth mother 指“亲生母亲”，birth 用来说明因分娩而建立的母子血缘关系。
They invited their birth father to the family reunion.
他们邀请了他们的生父来参加家庭聚会。
用法提示：birth father 指“亲生父亲”，birth 作定语强调家庭中的血缘关系。
birth 用在 parent、mother、father 等词前，表示因分娩而有血缘关系的，不能单独作表语。
She decided to contact her birth father.
她决定联系她的生父。
birth child/children 指亲生的子女，与收养或继子女相对。
They have two birth children and one adopted son.
他们有两个亲生孩子和一个养子。
birth family 指有血缘关系的原生家庭，常用于收养语境。
He was adopted and later searched for his birth family.
他被收养，后来寻找自己的原生家庭。
grammar · medium
易错句子She met her born mother for the first time last year.
正确表达She met her birth mother for the first time last year.
表示「亲生的、有血缘关系的」这一修饰义时要用 birth，放在名词前面，如 birth mother、birth parent。born 是 bear 的过去分词，只用于 be born（出生）这类被动结构，不能放在名词前表示血缘关系。汉语说「亲生母亲」，学习者容易受此提示误用 born。
grammar · medium
易错句子She is birth mother of two children.
正确表达She is the birth mother of two children.
birth mother 是可数的单数名词短语，前面必须有限定词（the / my / his 等），不能像汉语那样光杆使用。这里特指两个孩子的母亲，所以用定冠词 the。汉语名词没有冠词，学习者常把这一限定词漏掉。
生母
She met her birth mother for the first time last year.
她去年第一次见到了自己的生母。
生父
He tracked down his birth father through an online registry.
他通过一个在线登记网站找到了自己的生父。
亲生父母
The adopted girl spent years searching for her birth parents.
那个被收养的女孩花了多年时间寻找自己的亲生父母。
血亲家庭；原生家庭
He reconnected with his birth family as an adult.
他成年后与自己的血亲家庭重新建立了联系。
亲生子女
They have two adopted children and one birth child.
他们有两个收养的孩子和一个亲生子女。
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