挑战全球高端市场之外，刘强东还提出了另一个更为雄心勃勃的愿景，他希望未来能够造出售价10万元的游艇，让普通工薪阶层也能用得起。
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This is the same idea behind binary search. In a sorted array, you compare against the middle element and eliminate half the remaining candidates. In a quadtree, you choose one of four quadrants and ignore the other three regions. Each level narrows the search space by a factor of four instead of two.
Chris McCann, of the patient watchdog Healthwatch England, said: "The new contract will be welcome news for people who have struggled to access GP services.