scratch memory meaning in English

暂时存储器

The filter in bpf was implemented by a pseudo machine , which consists of an accumulator , an index register , a scratch memory store , and an implicit program counter . bpf can be directly programmed via ioctl system call and the pseudo machine instruction set , it can also be programmed by using libpcap function library , which can access many kinds of packet capture facilities provided by oses ( bpf is the important one in them )
Bpf的过滤器是由假想的过滤器虚拟机实现的，对bpf的编程，可以通过ioctl系统调用和过滤器虚拟机的指令集来直接编程，也可以通过libpcap提供的库函数来编程，它能访问许多种操作系统内核提供的包过滤设施( bpf是其中重要的一种) 。