name the seven continents and four oceans.
海洋英文ppt介绍
地球上目前最大的大洋是太平洋,它覆盖了地球表面的30%以上,并且在最
unit we're trying to save the earth!
1亿平方千米, 其中海洋面积占71%,陆地面积占29%
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