frequency是什么意思
- 英式英标[\'frikwənsi]
- 美式音标[\'friːkw(ə)nsɪ]
中文词源
frequency 频率
来自frequent, 频繁的。用于语音学名词。
英文词源
- 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.).
实用例句
- 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。
来自柯林斯例句
- 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。
来自《权威词典》
- 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.
来自《简明英汉词典》
- 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.
来自《简明英汉词典》
- 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.
来自《简明英汉词典》
