first down
first-down的词性:
n.Football (名词)【橄榄球】
1. The first in the series of four downs in which an offensive team must advance ten yards to retain possession of the ball.
第一次进攻:四次进攻中的第一次,进攻一方必须前进十码以得球
2. A gain of ten or more yards entitling the offensive team to a new series of downs.
再开始四次十码进攻权:推进十码或更远后使进攻队获得再一次进攻的权利