实体块

physical block的用法和样例：

例句

Variable Blocked - Each physical record contains more than one logical variable record.每个物理块包含多个可变长度的记录。
Ideally, the kernel tries to allocate contiguous blocks of physical memory as contiguous memory is most likely to evenly fill physically tagged caches.理想的情况下，内核尽量分配连续的物理块，这是因为连续内存很可能均匀地填充物理上紧挨的高速缓存。

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a tube of

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by the thousand