More than 20% overspent their income by more than $100 every single month.
超过20%的人每月支出比他们的收入多100美元以上。
2
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》
3
Whereas some of the low self-control study members are more likely to be single parents with a very low income and the parent is in poor health and likely to be a heavy substance abuser.