1·If the CONFIG_FRAME_POINTER option was set during kernel compilation, the frame pointer register is used to maintain stacks and, hence, the stack traceback can be performed correctly.
如果内核编译期间设置了CONFIG_FRAME _ POINTER选项，那么就用帧指针寄存器来维护堆栈，从而就可以正确地执行堆栈回溯。
2·If the test method does not run as anticipated, we will get an error (and a traceback describing the error).
如果测试方法没有按预期运行，我们将得到一个错误(以及描述这个错误的回溯)。
3·Finally, in the traceback, you start with the cell that has the highest score and work back until you reach a cell with a score of 0.
最后，在回溯的时候，从得分最高的单元格开始，回溯到得分为0的单元格为止。
4·You need to add a flag to run run -e so that you can avoid getting a traceback to the unittest module in the IPython shell.
您需要添加一个标记以运行 run -e，这样一来，您就可以在 IPython Shell 中避免回溯到单元测试模块。
5·Finally, you construct an actual LCS using the traceback.
最后，用回溯的方式构建实际的lcs。