It is this control, this mental discipline, that we are at risk of losing as we spend ever more time scanning and skimming online.
当我们花很多时间在网络上扫描和浏览信息时，我们正在面临失去这种控制力，这种智力训练的危险。
Using brain scanning techniques, they're gaining clues about why some young people develop mental illnesses.
通过使用大脑扫描技术，他们已获得了可能解释一些年轻人为何会患精神疾病的线索。
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