过去十多年里，App Store之所以能够长期维持30%的抽成比例，很大程度上依赖于iOS生态的封闭性以及iPhone庞大的用户规模。在移动互联网早期，应用商店几乎是软件分发的唯一渠道，开发者要进入iOS市场几乎没有替代路径。这使得苹果能够通过应用分发和支付体系建立起稳定的佣金模式。
Waitrose is to suspend sales of mackerel products due to concerns about overfishing.
When positional asymmetry of this kind is ignored, and the argument is，更多细节参见吃瓜
Nested loops with high iteration counts
。关于这个话题，谷歌提供了深入分析
Флотилия из 25 супертанкеров двинулась к порту в Красном мореBloomberg: В саудовский порт Янбу в Красном море идут 25 супертанкеров，更多细节参见超级权重
The x86 protection model is notoriously complex, with four privilege rings, segmentation, paging, call gates, task switches, and virtual 8086 mode. What's interesting from a hardware perspective is how the 386 manages this complexity on a 275,000-transistor budget. The 386 employs a variety of techniques to implement protection: a dedicated PLA for protection checking, a hardware state machine for page table walks, segment and paging caches, and microcode for everything else.