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.).
雙語例句
1. Their instruments detected very faint radiowaves at a frequency of 3 kilohertz.
他們的儀器檢測到一個3千赫的微弱無線電波。
來自柯林斯例句
2. Fatal road accidents have decreased in frequency over recent years.
近年來致命交通事故發生率已經下降。
來自《權威詞典》
3. If we can know their frequency we will monitor their talking.
如果我們知道他們的頻率,我們就能監聽他們的談話.
來自《簡明英漢詞典》
4. The drug can reduce the frequency and severity of attacks.
這種藥能降低發病次數和嚴重程度.
來自《簡明英漢詞典》
5. Fatal accidents have decreased in frequency over recent years.