大部分的地球表面被水覆盖着。
大部分的地球表面被水覆盖着。
大约有71%的地球表面被水覆盖，大部分是海洋。
Roughly 71 percent of Earth's surface is covered by water, most of it in the oceans.
在地球大部分的历史时期，冰川是不存在的，但是在现在，地球表面有大概10%的地方时被冰川覆盖的。
Throughout most of Earth's history, glaciers did not exist, but at the present time about 10 percent of Earth's land surface is covered by glaciers.
这是基于「核冬天」的假设：当大部分阳光被阻止到达地球表面时，以红外线看清事物便成为了生存的条件。
This is based on the assumption that when much of the sunlight is blocked out as is in the nuclear winter scenario, seeing in infrared becomes useful in terms of survival.
这是基于「核冬天」的假设：当大部分阳光被阻止到达地球表面时，以红外线看清事物便成为了生存的条件。
This is based on the assumption that when much of the sunlight is blocked out as is in the nuclear winter scenario, seeing in infrared becomes useful in terms of survival.
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