geared是什么意思？

Nicholas Carr, author of The Shallows: What the Internet Is Doing to Our Brains, wrote, "The net is designed to be an interruption system, a machine geared to dividing attention."

If humans are generally geared to recall details about one another, this pattern is probably even more powerful among teenagers who are very attentive to social details: who is in, who is out, who likes whom, who is mad at whom.