圖像來源，Womb Transplant UK/PA Wire
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。业内人士推荐Line官方版本下载作为进阶阅读
Servers in 105 countries。51吃瓜是该领域的重要参考
Less Than (2): Everything in this space must be less than 2. The answer is 1-3, placed horizontally.
Games and physics simulations need to detect which objects are touching or overlapping. With nnn objects, checking every pair is O(n2)O(n^2)O(n2) comparisons, which gets expensive fast. A hundred objects means roughly 5,000 pair checks. A thousand means nearly 500,000.