Finally there is the main memory which relative to the external cache memory is very slow.
这样，相对外部高速缓存存储器，主存的速度非常慢。
He job of cache coherency is done partially by the hardware and partially by the operating system.
保证高速缓存一致性的工作由硬件和操作系统共同分担。
A hidden fund or supply stored for future use; a cache.
积聚，囤积为备将来使用而藏起来的钱或物；密窖，贮藏处
