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.
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.
差的投资者只提供2个名字，并且要求你给予时间进行调查前的准备。
The bad ones will give you two names and ask for time to prep them ahead of time.
应用推荐