用“backfield”造句大全，backfield造句
(football) a person who plays in the backfield.
An offensive backfield player whose position is behind the quarterback and halfbacks and who primarily performs offensive blocking and line plunges.
The backfield player whose position is behind the line of scrimmage and who usually calls the signals for the plays.
the position of the football player in the backfield who directs the offensive play of his team.
