双语例句原声例句
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地球上早期的生命形式被限制在海洋里，因为水是帮助它们抵御紫外线辐射的唯一有效保护。
Early life-forms on Earth were confined to the oceans because water was the only available protection they had against ultraviolet radiation.
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复杂的生命在地球表面进化，而不是在火星或太阳系的其他行星上，因为在那些行星上，早期的地表生命被紫外线杀死了。
Complex life evolved on the Earth's surface, but not on Mars or other planets in the solar system because on those planets, early surface life was killed by UV radiation.
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在气候变冷期间，大多数迁徙者预计将前往靠近赤道的非洲，因为在气候变冷的地球上，这是栖息地变化所决定的方向。
During cooling most migrants would be expected to travel toward Africa, which is near the equator, since this is the direction dictated by habitat changes on a cooling Earth.
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It's a useful concept on the Earth, because Earth is approximately inertial.
这种观点在地球上很有用,因为地球很接近惯性状态
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