Take several sheets of paper and assign at least one sheet for each of the following broad categories.
写！拿几张表格纸，把属于每一个类别下面的广泛的小类至少要分配到一张表格中。
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。
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。
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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