少年比利和道格加入当地帮派后,面对这个暴力的世界,年纪尚轻的他们无力自保。。Consumers love - and live on - their smartphones, tablets and laptops. A cascade of new devices pours endlessly into the market, promising even better communication, non-stop entertainment and instant information. The numbers are staggering. By 2020, four billion people will have a personal computer. Five billion will own a mobile phone. But this revolution has a dark side, hid...。