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留守儿童王安全、王安心兄妹俩和爷爷一起生活在西部的大山里，家里唯一的一头老牛是兄妹俩感情的寄托。因为爷爷答应他们等老牛产牛犊卖钱后，就让兄妹俩去看望远出打工的父母。然而，突如其来的变故，为了救治打工中意外受伤的儿子，爷爷只好无奈的将老牛卖掉。从此，不知真相的兄妹俩踏上了漫漫的寻牛路。。Our solar system was the first to attract humans and filled their souls with awe and fear. At the same time brave minds had been curious about its nature and kept speculating about the universe and its objects. However since the birth of modern science and technology, the true nature of universe has been known and at this point of time, universe is so huge that our hearts are f...。该纪录片分为两部分，讲述了一位母亲把女儿送给别人收养，在后者于1989年失踪后，这位坚毅的女性揭开了该案的重重迷团。。