Another persistent source of Arab human insecurity is high unemployment.
Perhaps the greatest, most persistent source of torment in Jackson's life was his family.
This is a persistent source of strain and conflict in modern societies.
The ideology of American lawyers has been a persistent source of discussion and debate.
However, corruption allegations have been a persistent source of trouble for the DPA.
This is of notable importance because residual NAPL can act as a non negligible persistent source of contamination.
"Europa," the old continent, persistent source of hordes of migrants to the New World, has become the ersatz United States of modern asylum-seekers.
But the economy, he said, "is a persistent source of discontent," unlike the other two, which can ebb and flow depending on daily events.
China's military exports, particularly weapons sales to Pakistan and Iran, have been a persistent source of tension in relations between China and the United States.
Control over the site has been a persistent source of friction between Israel and the Palestinians, and has sparked violence between the two sides.
The origin of the bursts, the nature of the persistent source and the properties of the local environment are still unclear.
