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It is usually expressed as (Hz) Hertz or CPS (cycles per second). 一个完整周期为360度，相角就是用度数来表示两个波的距离。
The number of cycles per second is the frequency. 而频率则是指每秒可完成的周期数。
In the US most household current is AC at 60 cycles per second. 在美国，大部分家用电器使用赫兹的交流电。
A unit of frequency equal to one cycle per second. 赫兹频率的单位，等于每秒一周
Frequency is measured in hertz, or cycles per second. 频率用赫兹即每秒钟的周数来计算。
This radio signal has a frequency of 800000 cycles per second. 这个无线电讯号的频率是每秒八百千周。
Having a pitch corresponding to a relatively small number of sound-wave cycles per second. 低音的与一相对少量的每秒钟音波周期相对应的低音的
They typically center on a range of 1. 5 to 4 cycles per second. 频率集中在每秒1.;5周至每秒4周之间。
The frequency of modulation was 40 cycles per second. 调制频率是每秒钟40个周期。
Analogue bandwidth is measured in Hertz (Hz), cycles per second. 类比式频宽以赫兹测量每秒的传送周期.
Electricity in El Salvador is 115 Volts, alternating at 60 cycles per second. 萨尔瓦多电流的电压是115伏特、60赫兹。
The hertz (Hz), a unit of frequency in cycles per second, is named for him. 频率单位hertz（Hz，等于每秒周数）即是以他的名字命名。
In fact, many cortical cells are known to fire at rates between10 and40 cycles per second without external provocation. 事实上，许多皮质神经元在没有外来刺激的情况下，每秒的放电频率是10~0次。
For low-frequency currents(up to about 15, 000 cycles per second)an iron core, called a magnetic circuit; is placed. 对于低频率电流（约15，000周/秒以内），置有一个叫作磁路的铁心。
Electricity in Czech Republic is 230 Volts, alternating at 50 cycles per second. 捷克共和国电流的电压是230伏特、50赫兹。
Electricity in Papua New Guinea is 240 Volts, alternating at 50 cycles per second. 巴布亚新几内亚电流的电压是240伏特、50赫兹。
Although Tesla developed several two-wire motors, these so-called split-phase designs ran best on currents of 50 cycles per second or less. 虽然特士拉研发出好几种双线式马达，但这些所谓的分相式设计最好是以50赫兹或更低频率的电流推动。
LIGO and the other ground-based detectors are sensitive to frequencies from a few tens of Hertz (cycles per second) to a few thousand Hertz. LIGO和其它的地基探测器对从几十赫兹（每秒的周期数）到几千赫兹的频率都是敏感的。
Humans in the prime of life can hear noises up to about 20,000 cycles per second. 人在壮年的时候可以听到最高20000周秒赫的噪音。
The speed of a computer is usually expressed in cycles per second. Typical machines operate at 100 to 200 megahertz or 100 million to 200 million cycles per second. 计算机的速度通常用每秒（执行）的（时钟）周期来表示。典型的机器运转在100到200兆赫或者说每秒100到200兆周期。