center of a group

例句：

1. 1.The center of the city is bustling with activity.
   城市的中心熙熙攘攘。
2. 2.The team's center needs to be more aggressive in defense.
   球队的中锋需要在防守上更加积极。
3. 3. The center of the room was filled with silence.
   房间里的中心充满了沉默。