Added to that is an atmospheric pressure about 90 times Earth’s: High overhead in the carbon dioxide (CO2) that passes for air is a layer of clouds, perhaps 10 to 20 miles thick, whose little drops consist mostly of sulfuric acid (H2SO4).
答案的翻译是高空中被看作是空气的二氧化碳形成了一层厚约10到20 公里的浓云,而浓云的主要成分为硫酸。