the mesosphere
noun/ðə ˈmezəsfɪə(r)/, /ðə ˈmiːzəsfɪə(r)/
/ðə ˈmezəsfɪr/, /ðə ˈmiːzəsfɪr/
[singular]- the part of the earth’s atmosphere that is between 50 and 80 kilometres from the ground, between the stratosphere and the thermosphere
（大气层的）中间层