Echoecho routes around this problem by using a very nifty permission-based solution.
双重回音通过使用一流的许可方式来解决这个问题。
Nick Bicanic's startup EchoEcho, for example, is a very discreet service for letting one friend know where you are at a time, emphasizing extreme ease of use.
比如说尼克·比查尼奇（NickBicanic ）创办的EchoEcho，它提供地理定位时就显得很慎重，只是让朋友知道你在哪儿，强调的是简单易用。
Unlike other location-based application, echoecho doesn't force you to constantly broadcast your own location. Instead, the application takes the opposite route.
然而，和别的位置应用不同的是双重回音并不强迫你去持续的广播你的位置；取而代之，这款应用采取了相反的方式——你不告诉别人你的位置，你去询问别人的位置。
Unlike other location-based application, echoecho doesn't force you to constantly broadcast your own location. Instead, the application takes the opposite route.
然而，和别的位置应用不同的是双重回音并不强迫你去持续的广播你的位置；取而代之，这款应用采取了相反的方式——你不告诉别人你的位置，你去询问别人的位置。
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