When the program execution leads to instructions not in the cache, then the instructions need to be fetched from the main memory and the microprocessor has to stop and wait.
当程序执行导致命令不能从快取内存中找到时，需要从主内存中找到命令，那是微处理器就停下来等待。
This smaller memory is called cache RAM and allows the microprocessor to execute at full speed.
这些小型内存芯片叫快取内存，能让微处理器达到最快速度。
Microprocessor engineers decided to give the cache memory a cache.
微处理器工程师在原有快取芯片上再加上一个快取芯片。
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