If a function is called from many places, use the stack backtrace to determine the specific calling sequence.
如果在许多地方调用了一个函数，可以使用堆栈跟踪检查调用序列。
The preceding part of the error message shows the context where the exception happened, in the form of a stack backtrace.
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 backtrace 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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