求NearlyoneoutofthreebirthsinAmericaistoasinglemother.的详细分析,主要是句子的主干,句子的主干birthistoamother,这个是啥句型,

Question

求Nearly one out of three births in America is to a single mother.的详细分析,主要是句子的主干,
句子的主干birth is to a mother,这个是啥句型,

Answer 1

在美国,几乎每三个新生儿中就有一个来自单亲妈妈.
one out of three births：每三个中的一个
is to a single mother 是：is born to a single mother 的省略