那天夜里，当列车急驰过苏必利尔湖北部，穿越数片森林、向南驶往多伦多的时候，姐妹俩在车上睡着了。
That night, they slept as the train rushed through the night across the top of Lake Superior, through the forests and southward toward Toronto.
大批旅鼠开始了穿越斯堪的纳维亚平原的漫长而艰难的旅程，这段旅程可能持续数周。
Great numbers of the lemmings begin a long and hard journey across the Scandinavian plains, a journey that may last weeks.
这也就是PCR呈现负值会出现的情况。 因为PCR负值的反应堆会自动限制穿越反应堆的中子数，所以会在短暂的能量增加后减慢增长速度。
This is where having a negative PCR is handy, because it automatically limits the number of neutrons flying through the reactor, so it damps itself down after a momentary power increase.
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