From 1970 to 2005, the proportion of children under 18 living in the single-parent family has fallen by 17 percent.

从1970年到2005年，美国生活在单亲家庭的18岁以下孩子的比例，下降了17个百分点。

youdao

The proportion of single parent families varies between different income groups.

单亲家庭比例在不同收入群中各不相同。

《牛津词典》

A careful reading of the text reveals that most of the firstborn children in the sample were from single-parent homes in which the father was absent.

仔细阅读文本就会发现，样本中大多数头生子女都来自没有父亲的单亲家庭。

youdao

It shows more than half of the female victims were orphans or came from single-parent families.

VOA: standard.2009.10.04

But the rise of single-parent families in itself has complex social causes, and it will not be reversed by politicians.

ECONOMIST: The poor are still there, and need helping

Curiously, as blogger Tom Maguire notes, Blow himself has written on the dangers of single-parent households to black children in particular--in 2008, when he congratulated Barack Obama for his candor in raising the question.

WSJ: 'Right Wing Lice'

Aside from the basics - utilities, schools, clean streets, efficient public transport - at which Tokyo traditionally excels, the Japanese megapolis provides sign-language interpreters for the deaf, home helpers for the elderly, and subsidies for single-parent households.

CNN: Tokyo