低端机越来越少，中端机越来越难卖，高端机的市场固然在扩大，可门槛依旧很高，这种行业的加剧分化，可能让国产手机厂商上下探索的空间变得更小。往悲观的方向想，这会将整个行业拖入一个新的低谷。
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Now that we can build the tree, let's use it to search. Finding a specific point means starting at the root and asking: which child quadrant contains this coordinate? Then you recurse into that child and ask again. Each level of the tree cuts the search space by roughly three-quarters.，推荐阅读爱思助手下载最新版本获取更多信息
Prof Carissa Véliz of the Institute for Ethics in AI at Oxford University said trusting a firm to keep its word about how it uses sensitive data was another challenge.