This is the link.

来源: 光说不练于 2014-03-11 08:21:32 [旧帖] [给我悄悄话] 本文已被阅读：次

http://www.washingtonpost.com/blogs/the-switch/wp/2014/03/10/technology-tracks-our-every-move-how-can-an-entire-plane-go-missing/

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