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托福听力练习-科学美国人60秒:身处险境手机精准定位不准

2017-02-18 17:33:00来源：科学美国人60秒

点击查看>>科学美国人60秒音频：身处险境手机精准定位不准

　　科学美国人60秒中英文翻译：身处险境手机精准定位不准

　　科学美国人60秒英文文本

　　Touch your smartphone screen and you get local weather or a street map.

　　So you might assume that mobile phones know exactly where you are.

　　But get into trouble and you might find your phone isn't watching you as closely as you thought.

　　Emergency responders recently told the Wall Street Journal that their 911 dispatchers have trouble getting help to the location of cell phone callers.

　　And a report this summer showed more than half of all California wireless 911 calls in certain areas didn't have location information.

　　One way to locate a cell phone is through GPS, assuming the phone has one and it's outdoors.

　　Another is through location-based services.

　　These follow the signals sent between your phone and your wireless network's radio towers.

　　But towers can be miles apart, making it hard to pinpoint locations and adding minutes to response times.

　　Responders want wireless companies to include location data with each call, something privacy advocates oppose.

　　It's a matter of perspective.

　　Sometimes you want to be off the grid.

　　But in a crisis, the grid could be your best friend.

　　中文翻译请点击下一页

本文关键字: 托福听力练习 科学美国人60秒

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