But spending too much time online is unhealthy and makes it very difficult to
focus on/ concentrate on
focus on/ concentrate on
（集中精力于）other things in life．

【答案】focus on/ concentrate on

【解答】

【点评】

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发布：2024/12/10 0:30:1组卷：51引用：3难度：0.8

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But spending too much time online is unhealthy and makes it very difficult tofocus on/ concentrate onfocus on/ concentrate on （集中精力于）other things in life．