The BTP command takes a process ID as an argument and does a stack traceback for that particular process.
btp命令将进程标识作为参数，并对这个特定进程进行堆栈回溯。
The preceding part of the error message shows the context where the exception happened, in the form of a stack traceback.
错误信息的前半部分以堆栈的形式列出异常发生的位置。
In general it contains a stack traceback listing source lines; however, it will not display lines read from standard input.
通常在堆栈中列出了源代码行，然而，来自标准输入的源码不会显示出来。
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