the troposphere
noun /ðə ˈtrɒpəsfɪə(r)/
/ðə ˈtrəʊpəsfɪr/, /ðə ˈtrɑːpəsfɪr/
[singular] (specialist)- the lowest layer of the earth’s atmosphere, between the surface of the earth and about 6–10 kilometres above the surface
Topics Spacec2对流层(大气的最低层,在地球表面和 6 至 10 公里上空之间) 词源early 20th cent.: from Greek tropos ‘turning’ + sphere.