The industry hasn't quite embraced modular smartphones just yet, even though there have been some nifty concept designs. Google's Project Ara prototype goes back more than a decade, and the same can be said of other concept designs that never saw the light of day.
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A tram derailed and crashed into a building in Milan on Friday, killing two people and injuring 38 others.，详情可参考WPS官方版本下载
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This story was originally featured on Fortune.com