strange formations are exposed in the naked rock. 裸露的岩石显露出奇特的造型

45. From the space deserts are very conspicuous.
    从太空中看 沙漠非常显眼
46. Dunes of sand hundreds of miles long streak their surface.
    绵延数百英里的沙丘像是一条条皱边花纹
47. With no cloak of vegetation to conceal them
    由于没有植被覆盖
48. strange formations are exposed in the naked rock.
    裸露的岩石显露出奇特的造型
49. Africa's Sahara is the largest desert of all.
    非洲的撒哈拉沙漠是世界上最大的沙漠
50. It's the size of the United States
    它的面积相当于美国
51. and the biggest source of sand and dust in the entire world.
    也是全世界最大的沙尘源

来自《行星地球 第一季 第五集 Planet Earth S01E05 沙漠》第 48 行