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the mesosphere

noun

🔊/ðə ˈmezəsfɪə(r)/, 🔊/ðə ˈmiːzəsfɪə(r)/

🔊/ðə ˈmezəsfɪr/, 🔊/ðə ˈmiːzəsfɪr/

[singular]

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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Topics Spacec2