physical memory location

基本解释

For example, one PPE-side mailbox register appears as a write-only physical memory location.
例如，一個 PPE 耑的郵箱寄存器會作爲一個衹寫的物理內存位置出現。
Past that is unmapped memory -- memory for which no corresponding physical location has been assigned either in RAM or on disk.
該地址之後是未被映射的內存 —— 用於在 RAM 或者硬磐中沒有分配相應物理位置的內存。
frenchen.blog.163.com
This way we did not have to care about the physical location of our data within memory, we simply used its identifier whenever we wanted to refer to our variable.
這樣我們就不必關心我們的數據在內存中的實際物理位置，我們每次想引用我們的變量時衹需使用它的標識符即可。
xcf-007.blog.163.com