And then, later he added a zeroth rule.

然后，后来他添加了第零条规则。

Under the first law, a robot could not harm a dangerous gunman, but under the zeroth law, a robot could kill the gunman to save others.

根据第一条法则，机器人不能伤害危险的枪手，但是根据第零条法则，机器人可以杀死枪手来拯救其他人。

You could look it up yourself, but sometimes it is a lot quicker to do your best, you know, zeroth effort, guess and then have the machine say, I'm pretty sure this is what you meant.

你可以自己查一下， 但有时尽力而为要快得多，你知道，零努力，猜测，然后让机器说，我很确定这就是你的意思。