Segmentation maps a logical address (a 16-bit selector plus a 32-bit offset) to a 32-bit linear address, enforcing privilege and limit checks along the way. Paging then translates that linear address to a physical address, adding a second layer of User/Supervisor and Read/Write protection. The two layers are independent: segmentation is always active in protected mode, while paging is optional (controlled by CR0.PG).
have a heap allocation.
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url: https://example.com/hello
後來，高先生帶母親去醫院檢查，診斷發現她的脊柱關節移位。醫生解釋，長時間低頭看手機，頸椎和腰椎承受了超出承載能力的壓力。乾眼症、青光眼、頸椎病、肩周炎，這些原本要到八、九十歲才會集中出現的老年病，正在六、七十歲的「低齡老人」身上提前暴發。山東那位因熬夜刷手機導致一側眼睛近視度數飆升至2300度的70歲老太太，不過是這場健康危機中最極端的案例。
* @param arr 数组