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难词探意rninfancy/'Inf?nsi/n. 婴儿期rnMany parents worry that their children's use of electronic devices will bring harm to their chil-dren, so they set strict limits on their use of electronic devices. But there's another device-related danger that parents may be completely ignoring—second-hand screen time. With second-hand screen time, kids are indirectly exposed to screens being used by someone else close to them.