?集中在

heal th: ? 健康保障： concentrate in ? 集中在 She regarded her boredom at home by learning how to use the Internet ? 她认为她在家里的无聊学习如何使用互联网 ..

?把…集中在…上

... concentrate sth against the enemy's position集中(炮火)轰击敌人的阵地 concentrate in把…集中在…上 concentrate in class专心听讲 ...