詞匯表：
Samantha Hayes
Labor Department
The U.S. unemployment rate is down one-tenth of a point. It went from 9 percent in January to 8.9 percent in February. That's the lowest unemployment has been since April of '09. But experts still have some concerns about the future of the U.S. economy. Samantha Hayes explains some of those concerns and breaks down some more details from this month's unemployment report. The Obama administration was cautiously upbeat Friday after the Labor Department's February jobs report showed a slight dip in unemployment, to 8.9 percent from 9 percent in January.