单词 | Van Allen belt |
释义 | Van Al·len belt ![]() n. Either of two toroidal zones containing high-energy ionized particles trapped in Earth's magnetic field and surrounding the planet, beginning at an altitude of about 800 kilometers (500 miles) and extending tens of thousands of kilometers into space. [After James Alfred Van Allen (1914-2006), American physicist.] |
随便看 |
|
英语词典包含135693条英英释义在线翻译词条,基本涵盖了全部常用单词的英英翻译及用法,是英语学习的有利工具。