How come a big ice age happened when carbon dioxide levels were high?
在大冰河期，二氧化碳含量水平怎么会高呢？
On the other hand, the solid is NOT dry ice (carbon dioxide solid).
另一方面，该固体不是干冰(二氧化碳固体)。
Its surface temperature matches that of carbon dioxide ice, but might water ice lie underneath?
那里的地面温度符合使二氧化碳冰冻的温度，但在那之下是否还潜伏著水冰？
Its surface temperature matches that of carbon dioxide ice, but might water ice lie underneath?
那里的地面温度符合使二氧化碳冰冻的温度，但在那之下是否还潜伏著水冰？
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