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但是研究显示，孩子花费越多的时间在荧屏前，不管是电视还是即时短信，他们的学习成绩就会越差。

But research has shown that the more time kids spend in front of screens - whether it's TV or instant-messaging - the worse their school performance.

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还可以使用- D开关显示每个系统调用的时间差，时间差表示自前一个事件以来流逝的秒数。

You can also use the -d switch to display each system call with a time delta, representing the elapsed time in seconds since the last event.

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