What this means is that even if something tries to use Flash to put malware on your computer, the mis-behaving program is stuck inside a virtual sandbox where it can’t get to the rest of your PC.
也就是说,就是有人使用Flash往你电脑上安装了恶意软件,这个不怀好意的程序将被限制在一个虚拟沙箱中,并不能访问你电脑的其他部分。