translation.en: The computers back up each other. There's a voting system -- if one computer is not agreeing with the other three, it's kicked out of the system.
translation.zh: 4台计算机可以相互补充。这里还有一套投票系统—— 如果一台计算机不同意其他3天， 那么这台计算机就被系统否决了。