NSD在运行时，会附加到每个进程和线程，以转储调用堆栈。

When NSD runs, it attaches to each process and thread, to dump the calls stacks.

youdao

包含线程和方法调用堆栈框架。

Contains the thread and method call stack frames.

youdao

注意，这个调用堆栈当然将会按前面描述的过程优化。

Note, of course, that this call stack will be optimized in the ways described earlier.

youdao

And, again, the rectangle represents your computer's RAM, the bottom represents the part of RAM that we generally call the stack, main conceptually ends up on the bottom of the stack followed foo by its local variables then the function say foo that it calls and on and on and on and up, but there is, in fact, something above all of this and we've seen this picture briefly and that's this thing called the heap.

再次，矩形表示的是计算机内存，底端表示内存的一部分,通常我们把它叫做堆栈，main函数在,堆栈的底端，之后是,它的局部变量，然后是它调用的函数,等等等等，但是那里有，实际上，在这个上面，我们粗略看看这个图画,这个东西叫做堆。

哈佛公开课 - 计算机科学课程节选