| 词源 |
radar; laser. These are among the most widely used and last- ing of scientific acronyms. Radar was coined from radio detect- ing and ranging during World War II, while laser came after the war, from light amplification by stimulated emission of ra- diation. The English alphabet can produce 456,976 acronyms composed of four letters and hundreds of thousands more if ei- ther additional or fewer letters are used. See quasar. |