例句與造句

1. Persistent poverty counties are defined as those where 20 % or more of the county population in each of the last four decennial Censuses had poverty level household incomes.
2. A 2011 U . S . federal law defined a persistent poverty county as one in which " 20 percent or more of its population [ has lived ] in poverty over the past 30 years " according to the Census, which is done every 10 years.
3. It's difficult to find persistent poverty counties in a sentence. 用persistent poverty counties造句挺難的