Correct or improve the translation of the following English sentences.原文：The Arctic covers some 5.5 million square miles: 8 percent of the earth's surface and 15 percent of its total landmass.译文：北极面积为550万平方英里：占地球表面的8%，占陆地总面积的15%。
Correct or improve the translation of the following English sentences.原文：The Arctic covers some 5.5 million square miles: 8 percent of the earth's surface and 15 percent of its total landmass.译文：北极面积为550万平方英里：占地球表面的8%，占陆地总面积的15%。
