原因之一大概在于，如果青少年如果盯着屏幕的时间增多，那么同时参与积极向上的活动的机会就会降低。
One possible reason is that teens who increase their screen time are simultaneously reducing involvement in and opportunities for more active pursuits.
研究的结果也印证了，许多富有激情的作家、艺术家、演员已经知悉的事实，（那就是）创造性的活动让人变得更加积极向上，而这些积极的影响会渗透到日常生活的方方面面。
The results reflect what many aspiring writers, artists and performers already know: getting creative feels good, and those positive effects can and do seep into other aspects of daily life.
我学习勤奋，积极向上，喜欢和同学讨论并解决问题，经常参加班级学校组织的各种课内外活动。
I study hard, positive and students discuss and resolve questions, often in class the school beyond the various classes.
但令人可悲的是，我参加学校里面各种各样的课外活动和社团活动，试图努力去树立起一种积极向上的有社会责任心的正面形象。
Still miserable, I turned to extracurricular activities and community service, trying to erect an identity in a facade of social responsibility and activism.
但令人可悲的是，我参加学校里面各种各样的课外活动和社团活动，试图努力去树立起一种积极向上的有社会责任心的正面形象。
Still miserable, I turned to extracurricular activities and community service, trying to erect an identity in a facade of social responsibility and activism.
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