在古代，跟踪全年日出和日落的时间点以预测季节的能力是关系到生存的关键问题。
The ability to predict the seasons - by tracking the rising and setting points of the sun throughout the year - was key to survival in ancient times.
这种陈年古代的悲剧性的占有和敌意说不定早已死去了，但是死去的东西在时间把它们清除掉之前，仍旧是有毒的。
It might be a dead thing, that old tragic ownership and enmity, but dead things were poisonous till time had cleaned them away.
磁极互换每30万年发生一次，每次需要近5000年的时间完成这个过程。 1995年在俄勒冈发现了古代岩浆不寻常的磁场状态。
The magnetic poles swap every 300, 000 years, a process that normally takes up to 5000 years.
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