第二问是考with 的复合结构.动词的现代分词表主动,水是主动覆盖在地表的,按照你的理解,twenty percent of its surface is cover by water.
而此句是water covers the twenty percent of its surface.
第二问是考with 的复合结构.动词的现代分词表主动,水是主动覆盖在地表的,按照你的理解,twenty percent of its surface is cover by water.
而此句是water covers the twenty percent of its surface.