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Use "front-line" in a sentence
"Those who are highly paid should have their salaries significantly reduced as has been done in Ireland, particularly those who are not so-called front-line workers."
"Much of that money is wasted, but programs like the Global Threat Reduction Initiative are our front-line defense against nuclear terrorism."
"Rebels said Saturday their forces entered the front-line oil town and were preparing for a renewed offensive later in the day."