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.
the front where an appropriately formatted passbook could be inserted, and like
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Note that every single one of these misuse the pattern field by adding beginning and end of string anchors. Presumably the authors don't know that they aren't needed.
行李的损坏不明显，旅客在离船时或者行李交还时难以发现的，以及行李发生灭失的，旅客应当在离船或者行李交还或者应当交还之日起十五日内，向承运人或者承运人的受雇人、代理人提交书面通知。