作为世界第三长河，它覆盖了中国陆地面积的五分之一。
As the world's third-longest river, it covers one-fifth of China's land area.
就全球而言，目前森林覆盖约占地球陆地面积的31%。
Globally, forests now cover about 31% of the Earth's land surface.
虽然岛屿的总陆地面积保持稳定或有所增长，但某区域可能被侵蚀而其他区域得到扩大。
Even on islands where the total land mass is stable or grows, one area may be eroded while another is being added to.
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