| 词汇 | frequency |
| 词根词缀 | 词源： 1640s, "fact of occurring often," from L. frequentia (see frequent). Earlier it had been used in a now-bsolete sense of "state of being crowded" (mid-16c.); sense in physics, "rate of recurrence," especially of a vibration, is from 1831. In radio electronics, frequency modulation (1922, abbreviated F.M.) as a system of broadcasting is distinguished from amplitude modulation (or A.M.). 词根记忆： n. 频率,周率This radio station broadcasts on three different frequencies.这家电台用三种不同的周率广播. |
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