这将导致温度进一步降低，产生更多结冰并可能出现失去控制的“雪球地球”情景。
This leads to a further reduction in temperature, creating more ice and possibly a runaway, 'snowball earth' scenario.
有证据显示，地球在大冰冻期不时会成为雪球，但研究人员仍不了解究竟发生了什么。
There's some evidence that Earth became a snowball at times during the big freezes, but researchers are still trying to work out exactly what happened.
“雪球地球”还是“泥球地球”？
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