Physics and Astronomy. A primary ray or particle, esp. a primary cosmic ray (cf. sense A. 22).
| 单词 | θ79371 |
| 释义 | the world > matter > physics > atomic nucleus > radioactivity > ionizing radiation > [noun] > cosmic rays (10) primary1923 Physics and Astronomy. A primary ray or particle, esp. a primary cosmic ray (cf. sense A. 22). cosmic rays1925 high-energy radiations with great penetrative power which are incident on the earth from all directions and which originate in outer space (primary… Subcategories:— level of radiation from (2) — group of particles (2) — large or intense pulse (2) — indication of occurrence (2) |
| 随便看 |
|
英语词典包含1132095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。