Because the value of the counter exists only in the memory of the running program, the values will start over if the program is restarted.
因为计数器的值仅存在运行程序的内存中，如果程序重启，那么这些值将重新开始。
2
That program counter points to some location in memory typically to the first instruction in the sequence.
程序计数器指示存储器当中的某些位置，尤其是指示序列中的第一个指令。
3
Since Perl doesn't have memory allocation issues, the biggest source of bugs for me has been the improper tracking of counter variables (wrong initialization, wrong increments, or wrong bounds).