frequencies是什么意思？

frequencies

英['frɪkwənsɪz] 美['frɪkwənsɪz]

• n. （某事发生可重复的）频率( frequency的名词复数 )，发生率，（声波或无线电波的）振动频率，经常发生；

例句

• The characteristic values are the filter's middle frequencies and their bandwidths. 滤波器有中间频率和带宽这两个特征值.
• Sound - cancelling works by analysing any unwanted frequencies and then producing counteracting ones. 通过分析所有不需要的声音频率,然后制造相应的部分替代,这样噪声就消除了.
• The electromagnetic spectrum covers an enormous range of frequencies and energies. 电磁波谱包括极大的频率和能量范围.
• If the frequencies are low, this approach cannot be used. 若频率很低时, 这种方法就不能使用.
• At low frequencies, such as 10 per sec., pulsation is sensed rather than vibration. 在低频率(譬如每秒十次)时, 所感觉到的是脉冲而非振动.
• Twisted - pair conductors are sufficient if frequencies of interest are below a few hundred kilohertz. 如果信号频率低于几百kHz,则使用双绞线就已足够.
• A wavefront at high radio frequencies or optical frequencies impinging on the atmosphere is distorted. 高射电频率或光学频率的波阵面进入大气时受到畸变.
• Of an electronic circuit or device; having an output proportional to input; amplifying or attenuating all frequencies equally. 说明一种电子电路或器件, 其输出和输入成比例, 对所有的频率都放大或衰减同样的倍数.
• ...UHF frequencies of around 900 megahertz. 大约900兆赫的超高频率
• For an initial service, a 10 megahertz-wide band of frequencies will be needed. 初始服务需要10兆赫宽的频带。

柯林斯高阶英汉双解学习词典释义

• N-UNCOUNT
  频率;发生次数
  The frequency of an event is the number of times it happens during a particular period.
  例句
  The frequency of Kara's phone calls increased rapidly... 卡拉的电话飞速增多。 The tanks broke down with increasing frequency. 坦克越来越频繁地熄火。
• N-VAR
  (声波或无线电波的)频率，周率
  In physics, the frequency of a sound wave or a radio wave is the number of times it vibrates within a specified period of time.
  例句
  You can't hear waves of such a high frequency. 如此高频率的声波是无法听到的。 ...a frequency of 24 kilohertz. 24 千赫的频率