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wa zu yi lei qi te de hai wa
Author(s): 
Pages: 22
Year: Issue:  6
Journal: Ocean World

Abstract: <正> 春夏是蛙类王国最热闹的季节,人们可以看到形形色色的蛙类。目前生活在地球上约有2600多种蛙。它们绝大多数生活在热带和亚热带潮湿多雨的淡水地区,而广阔的海洋是蛙类的禁区,因为蛙类光溜溜地裸露皮肤,身体表面又
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