根据第一定律，机器人不能伤害带来危险的枪手，但根据第零定律，机器人可以杀死枪手以拯救他人。
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.
生活在那些日子的危险事件将包括头部会被天空掉下来的火箭零件击中。
One of the hazards of living in those days will include getting conked by spare rocket parts falling from the sky.
冰层的消失已经意味着，乘坐狗拉雪橇拜访其他定居点充满了危险，然而零星浮冰的存在则意味着，坐船旅行也不是一种理想的选择。
The disappearing ice has meant that it is now too dangerous to visit the outer settlements on dog-sled, but what ice remains means that travel by boat is not an option either.
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