Doctors in Philadelphia studied how smartphones affect the health of teenagers.

費城的醫生研究了智慧型手機如何影響青少年的健康。

The doctors studied 1,959 children. They found that age 13 is a better time to get a phone. Children who got phones at age 12 had more problems with weight and sadness.

醫生研究了 1,959 名兒童。他們發現 13 歲是擁有手機更好的時機。12 歲就擁有手機的兒童，在體重與憂鬱方面有較多問題。

Using a phone for more than five hours a day is bad. It increases the risk of sadness and weight gain. Many children do not sleep enough because of their phones.

每天使用手機超過五小時是不利的。這會增加憂鬱與體重增加的風險。許多兒童因為手機而睡眠不足。

Doctors say parents must help. Parents should take phones out of bedrooms at night. They should also limit the time children use phones every day.

醫生表示家長必須幫忙。家長在晚上應將手機移出臥室。他們也應該限制孩子每天使用手機的時間。

Children are healthier if they get a phone at age 13 and use it less.

如果孩子在 13 歲才擁有手機且較少使用，會更加健康。