frequency

英 ['friːkw(ə)nsɪ] 美 ['frikwənsi]

解释

※ 提供单词"frequency"的中文意思、发音示范及音标对照，中英文词源、例句和用法等。

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.).

展开全部 ▼

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。

2. Fatal road accidents have decreased in frequency over recent years.: 近年来致命交通事故发生率已经下降。

3. If we can know their frequency we will monitor their talking.: 如果我们知道他们的频率,我们就能监听他们的谈话.

4. The drug can reduce the frequency and severity of attacks.: 这种药能降低发病次数和严重程度.

5. Fatal accidents have decreased in frequency over recent years.: 近年来死亡事故发生的频率已经下降.