Studies in the journals Geology and Earth-Science Reviews reveal that ancient rivers were broad straight sheets of water.
《地质学》和《地球科学评论》上的一项研究表明古代的河流是笔直宽阔的水面。
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Ice sheets are broad glaciers that blanket whole regions.
冰盖则是能把整个地区覆盖起来的广阔冰川。
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