The frequency of Kara's phone calls increased rapidly. [+ of]
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。
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. [+ of]
24 千赫的频率
...low frequency waves.
低频波
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