通过独立且轻便的小型设备，源源不断地获取外界信息。毕竟人类又不可能 24 小时举着手机，所以为了获取这些连续不断的视觉流，摄像头必须抢占人体感知器官的「高地」——也就是我们的耳朵和鼻梁。
Jim and Marilyn Lovell were high school sweethearts
，这一点在WPS下载最新地址中也有详细论述
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The pruned nodes (in red) represent entire regions of space that the algorithm never examines. The points inside those regions are never checked. Compare the "Nodes Visited" count to the total number of points. The quadtree is doing far less work than a brute-force scan.