The wrong settings in fstab crash

I modified file /etc/fstab and the modification was incorrect. The tragedy happened. I can not boot normal. When boot sequences go to mount device which record in fstab, then system boot failed. When system failed, there are two choices : one is entering fix state the other is booting again. In fix state, the file system is read only, so, you can do nothing about that. Finally, I use boot-disk and choose "linux rescue" to solve this stupid problem.