...是天狼星的科学家，在十五万馀年之前从其他的宇宙（Creation）进口到地球，用以支撑他们设置在地球周边的「冰罩层（ice shields）。当那些矿产被运走，冰罩层开始破裂溃散，十八周之后全球下起了倾盆大雨。
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shields of ice 气层中的冰天
Such entities had been collected by the ice shields, which had prevented their presence upon earth.
此类实体已被冰盖收集，并避免出现在地球上。
This was even more devastating than the collapse of the ice shields, and the journey from this point forward is the darkest period our species ever recalls.
这甚至比冰盖的坍塌更具毁灭性，且自这一点以后的旅程，是我们种族所能回忆的最黑暗时期。
Still others argue that volcanic dust injected into the atmosphere shields Earth from the Sun's rays and initiates an ice age.
还有人认为，注入大气的火山灰保护地球免受太阳辐射，并开启了一段冰河时代。
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