| 单词 | van allen radiation belt |
| 释义 | Van Allen radiation belt in American English (væn ˈælən) US 1. a broad, doughnut-shaped region surrounding the earth and composed of high-energy electrons and protons trapped in the earth's magnetic field at heights between c. 400 km (c. 250 mi) and c. 64,370 km (c. 40,000 mi) 2. such a region surrounding other planets, as Jupiter Word origin after James A. Van Allen (1914-2006), U.S. physicist |
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