我对他的回答做了笔记，我还在尝试把这个问题搞清楚，事情就这样发生了，一个系统本来运行良好，然后就变得很脆弱。

I got a note from him and I'm still trying to figure it all out That's what happens; the system performs very well and then it becomes vulnerable.

youdao

我对他的回答做了笔记，我还在尝试把这个问题搞清楚，事情就这样发生了，一个系统本来运行良好，然后就变得很脆弱。

I got a note from him and I'm still trying to figure it all out That's what happens; the system performs very well and then it becomes vulnerable.

youdao