the ocean covers three quarters of the earths surface ,produces 80percept of

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the ocean covers three quarters of the earths surface ,produces 80percept of

the ocean covers three quarters of the earths surface ,produces 80percept of
the ocean covers three quarters of the earths surface ,produces 80percept of

the ocean covers three quarters of the earths surface ,produces 80percept of
海洋占地球表面积四分之三,能产生( )的80%