GbEng
近来我们一些大城市中罪案频繁。 There has recently been an epidemic of crime in our major cities.
没有视频信号。 There is no video signal.
他变换了无线电传送的频率。 He varied the transmission frequency.
公共汽车频繁地从城市驶往机场. Buses run frequently from the city to the airport.
低频扬声器设计用来再现低音频率的扬声器 A loudspeaker designed to reproduce bass frequencies.
那条高速公路上车祸发生得越来越频繁。 Accidents on that highway are happening with increasing frequency.
调波一种频率是另一种波频率整数倍的谐波 A wave whose frequency is a whole-number multiple of that of another.
变频器将无线电讯号从一种频率转换成另一种频率的电子装置 An electronic device that converts one frequency of a radio signal to another.
鉴别器，鉴频器一种将输入信号的某一特征，如频率或相位转变为幅度变化装置，其变化大小因信号与标准或参考信号的不同程度而异 A device that converts a property of an input signal, such as frequency or phase, into an amplitude variation, depending on how the signal differs from a standard or reference signal.
以低于信号中最高频率两倍的频率进行信号取样时出现的一种效应，即当由取样状态还原时，还原后的信号将不再含有原来信号中的高频成分，并将显示出虚假的低频信号。 An effect that occurs when a signal is sampled at a rate less than twice the highest frequency present in the signal.The subsequent signal recovered from the samples will not contain the high frequency component of the original signal and will display a false low frequency signal.
时间表变动得如此频繁, 似乎没有什麽道理. It seems illogical to change the timetable so often.
一个频带的上下界频率之差，单位用赫兹表示。 The difference, expressed in Hertz, between the two limiting frequencies of a band.