金姆和泽赫经常发短信、打电话，甚至视频通话。
Kim and Zech often text, talk over the phone and even video call.
研究表明，那些经常发短信的人有更多的睡眠问题，且学习成绩也更差。
It shows that those who text a lot have more trouble sleeping and do worse in their study.
因为我的一个经常发短信的朋友莫名其妙的收到短信但是不会去看有什么内容。
Because my friend a., who frequently sends text messages, somehow fails to recognize that she might receive them as well and almost never checks.
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