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radiation belt

noun
🔊/ˌreɪdiˈeɪʃn belt/
🔊/ˌreɪdiˈeɪʃn belt/
(astronomy天文学)
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  1. a region surrounding a planet where charged particles (= very small pieces of matter) are held in place by the planet's magnetic field
    • The space mission provided new data on the Earth's radiation belts.这次太空任务提供了地球辐射带的新数据。