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1.A new study says today's teenagers are growing up more slowly than previous generations.
grow up长大；成熟
All plants like to grow up toward the sunlight.
所有的植物都喜欢朝着阳光向上长。
2.Researchers said that compared to teenagers from the 70s, 80s and 90s, today's teens, "are taking longer to engage in both the pleasures and the responsibilities of adulthood".
compared to与…相比，跟…相比
His legs were pitifully thin compared to the rest of his bulk.
他的双腿和他庞大身躯的其他部分相比瘦得可怜。
3.Professor Jean Twenge said: "The whole developmental pathway has slowed down."
slow down（使）慢下来；（使）生产缓慢
The car slowed down as they passed Customs.
过海关的时候，车速慢了下来。
