He ran it through MPC's orbit-projection software, which can tell how close an asteroid will come to Earth, and phoned Chesley to alert him of an impending collision.
2
有一天，我的一个最要好的朋友打电话给我，告诉我下载一个“美国在线实时信息传递”的聊天软件。
I was in my freshman year of college, and one day my best friend called me on the phone and told me to download "AOL instant messenger".
3
比如，苹果拒绝通过网络打电话(从而节省手机通话时间)的软件。
For example, Apple rejects programs that would let you make phone calls over the Internet, thereby avoiding using up cellular airtime.
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