在整个地质时期，它们随着自然地气候循环减小或涨大。
Over geologic time, they have ebbed and flowed with natural climate cycles.
劳克林说，在讨论气候变化问题时，必须对比过去地质时期的情况。
You can't discuss climate change, Prof. Laughlin says, without looking backward across geologic time.
如果你察看一下撒哈拉的地质记录就会发现，每当气候变暖，温度超过现在，撒哈拉的绿洲便会在这一时期反复出现。
If you look at the geological records in the Sahara, there have been repeated periods where the Sahara was greener when temperatures were warmer than today.
Paleoclimate -古气候指的是古代地质时期的气候条件。
Paleoclimate the climate conditions of geologic periods in the ancient past.
地质历史时期古海洋气候环境的演变也是古海洋学研究中的一项重要内容，具有十分重要的意义。
The evolvement of climate environment in the geological history is one important contents ofthe paleoceanography research and has an important significance.
白垩纪是地质史上一个典型的温室气候时期，国际上围绕白垩纪气候成因开展了一系列模拟研究。
The Cretaceous is a typical period for greenhouse climate in geological history and has become an important paleoclimate simulation period in international paleoclimate modeling community.
陕北植被变迁在地质时期以及历史时期早期，主要由气候条件所控制，植被类型随气候的冷暖干湿变化而变迁。
During the early geological and historic stage, it was the climate that mainly influenced the change of the vegetation in the north of Shaanxi.
陕北植被变迁在地质时期以及历史时期早期，主要由气候条件所控制，植被类型随气候的冷暖干湿变化而变迁。
During the early geological and historic stage, it was the climate that mainly influenced the change of the vegetation in the north of Shaanxi.
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