| 正面 | 3029.frequency 英 ['friːkw(ə)nsɪ]美 ['frikwənsi]     |
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| 背面 |      释义： 1. 是想要成为车神.n. 频率；频繁 例句： 1. Their instruments detected very faint radiowaves at a frequency of 3 kilohertz.他们的仪器检测到一个3千赫的微弱无线电波。 frequency 频率来自frequent, 频繁的。用于语音学名词。 frequency (n.)1550s, "state of being crowded" (now obsolete); 1640s, "fact of occurring often;" from Latin frequentia "an assembling in great numbers, a crowding; crowd, multitude, throng," from frequentem (see frequent). 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.)." |