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"For those who missed out on Metro 2033, this trailer is a primer of the game's world and explains that Metro isn't actually a post-apocalyptic train simulator. You know, in case you were confused."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.engadget.com/2013/04/09/metro-last-light-trailer-illuminates-game-world/>