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环球地理的主播胖胖和Tommy在小的时候，都有个这样的心愿，那就是——希望霸王龙那一双萌萌的小爪（或者说上肢）有一天能长大点，因为它看着实在是太不协调了。前一阵子在看了电影《侏罗纪世界2》后，总算心里痛快些了，因为电影里那只人工基因合成的“暴虐迅猛龙”，终于长了一对比例恰当的上肢。不过电影终究只是幻象，曾经真实于世界中的霸王龙为什么一定要长成这样呢？事情还真没有你想得那么简单！自打1900年，美国怀俄明州首次发现了霸王龙化石，从那一刻开始，科学家就为这一对“小爪”陷入了深深的困惑，“这小爪究竟是干吗用的？”这个问题让古生物学家纠结了一个多世纪。下面就让我们来听听，这一百多年里，都产生哪些新奇的解释。
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