※ 引述《springgod (≡27149≡陈春神)》之铭言：
: ※ 引述《jerryr (灰色的苦涩 .....)》之铭言：
: : Each page-table entry is usually 4 bytes long,
: : but that size can vary as well. A 32-bit entry
: : can point to one of 2(32) physical page frames.
: : If a frame is 4 KB, then a system with 4-byte
: : entries can address 2(36) bytes (or 64 GB) of
: 2(44) bytes 16 TB
: 20 + 12
: ^这个对映到2(32)
20+12 不解意义?
: 所以是32+12=44
32+12=44 可理解
: : physical memory.