frequency是什么意思_frequency怎么读_中英文释义(含例句用法)

the number of occurrences within a given time period;"the frequency of modulation was 40 cycles per second"
"the frequency of his seizures increased as he grew older"

the ratio of the number of observations in a statistical category to the total number of observations

the number of observations in a given statistical category

中英词源

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.).

词态变化

复数 frequencies;

权威造句

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。

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.

近反义词

repetition

相似短语

Alfven frequency 阿尔文频率

chopper frequency 遮光频率，间断频率，间歇频率

cold frequency 冷态频率

auroral frequency 极光频率

average frequency 调频中心频率

blanketing frequency 抑止频率

Bragg frequency 布拉格频率

broadcasting frequency 广播频率

absorption frequency 吸收频率

carrier frequency 载波频率，载频

单词分析

暂无,等待补充.

记忆方法