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之所以买A5而不买A5pro和a7，原因在于续航，A5用的是高通439的核心，省电优化比较成熟，A5pro虽然也有439的核心版，但运存小了，而A5pro和a7用的主要是紫光展锐的国产核心，在各种评价中实际耗电高，有说是这个芯本身耗电高，也有说是海信没有用心做好优化，反正就是续航不好

Previous attempts to make devices such as Kay’s Dynabook real – eg, Sony’s LIBRIé, released in 2004 – had been hampered by small libraries. Amazon’s library had no bounds, it had one-click purchasing. And, more generally, technology had improved: batteries were smaller, processors faster, e-ink displays higher-resolution. In the year of our lord, 2007, under the auspices of one company, all of the pieces came together making real those techno-prophecies of yore. Those of us of a certain codex geekery – myself included – were enthralled by its eccentricities and potential.