| 词汇 | radius |
| 词根词缀 | 词源： 1597, "cross-shaft," from L. radius "staff, spoke of a wheel, beam of light," of unknown origin. Perhaps related to radix "root," but Tucker suggests connection to Skt. vardhate "rises, makes grow," via root *neredh- "rise, out, extend forth;" or else Gk. ardis "sharp point." The geometric sense first recorded 1611. Plural is radii. Meaning "circular area of defined distance around some place" is attested from 1953. Meaning "shorter bone of the forearm" is from 1615 in Eng.; it was used thus by Roman writer Aulus Cornelius Celsus (1c.). 词根记忆： n. 半径,半径范围,有效航程,范围,界限The radiation radius of the radioactive radium radiator in the stadium is variable.放射性的镭暖气装置的辐射半径在体育场是易变的. |
| 随便看 |
英语词根词缀词典收录了31503条英语词根词缀词条，基本涵盖了全部常用英语词汇的词根、词缀及词根记忆法解析，是记忆英语词汇的必备工具。