| 词汇 | f.m. |
| 词源 | F.M.1922, abbreviation of frequency modulation as a method of encoding information in radio waves by varying the frequency of the wave. As a method of broadcasting radio programs, it began in the late 1930s and was notable for superior noise reduction and the capability of broadcasting in stereo. As the chosen medium for broadcasting stereo rock music it became popular in the 1970s. updated on May 07, 2020 |
| 随便看 |
英语词源词典收录了45867条英语词源词条，基本涵盖了全部常用英语词汇的起源、历史，是研究英语词汇或通过词源学英语的必备工具。