45%不对，虽然地球被71%的水覆盖，所以，但是可供人类使用的水只占这中间的2
Three-fourths of Earth's oceans is covered by water
楼主你好！翻译如下：
题目：71% of Earth's surface is covered by water.
2、3. Earth is a blue planet bacause 71% of its surface is covered with water.(二三两句放在一起比较好）
4.We hope that people will love our Earth more and take better care of her.
来自【英语牛人团】
地球海洋的四分之三是被水覆盖Three-fourths of Earth's oceans are covered with water.
The seabed is covered with water.我觉得改成海床被水覆盖比较好，不然逻辑上有问题
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Moser～子涵
