He is still gaining experience on the farm team.
The second-team games have fewer spectators than the first team.
He was demoted to the second team due to poor performance.
His strong play was recognized, and he was promoted from the second team to the first team.
一軍 is the top-level first team, while 二軍 is the reserve or developmental squad below it.
Compound of 二 (second) and 軍 (army, team), originally from military terminology, now common in sports.