当它们的茎被切断时，这些植物开始发出20到100千赫兹的“尖叫”，科学家们猜测这种尖叫可能是为了警告附近的其他植物。
When their stems were cut, the plants started "screaming" between 20 and 100 kilohertz, and the scientists guess that this scream is probably meant to warn other plants nearby.
用500千赫兹进行遇险通信。
用5680千赫兹以便通信。
用4125千赫兹以便通信。
在之前的研究中，志愿者分辨不出基音高于5千赫兹的旋律。
As in previous studies, the volunteers could not recognise melodies with fundamental tones above 5 kHz.
之前的研究表明，人类无法辨认基音在5千赫兹以上的音符。
Previous studies have shown that humans are unable to recognise melodies whose notes have a fundamental tone above 5 kilohertz.
全范围的频率响应(20赫兹- 20千赫兹)极其准确地再现语音和仪器。
Full-range frequency response (20 Hz - 20 KHz) for an extremely accurate reproduction of voice and instruments.
这个图显示了从一个大脑信号传输器传来的18.5-18.7千赫兹的频率。
This picture shows the frequencies 18.5 - 18.7 kHz which were sent from a brain transmitter.
研究小组接着选取一个音调低于5千赫兹的基本音，滤掉低于6千赫兹的所有声音。
The team then took a fundamental tone pitched below 5 kHz and digitally filtered it to leave just the overtones above 6 kHz.
而旋律很少由超过5千赫兹的基本调构成，大脑可能因此无法分辨这类陌生的旋律。
And melodies are rarely, if ever, composed with fundamental tones above 5 kHz, so the brain may be unable to recognise this unfamiliar class of melodies.
它们都工作在300千赫兹，直流母线电压400伏特，输出功率120瓦特，输出电压16伏特。
All of them have been operation at 300 kHz, bus voltage of 400 V, output power of 120 W, output voltage of 16 V.
直至最近，这种状况都是靠提高时钟频率达到的，在我有生之年，我已看到处理器主频从几千赫兹上升至几吉赫兹。
Up until recently, this was accomplished by accelerating the clock speed, which has leaped from kilohertz to gigahertz in my lifetime.
该过滤器都是连续可调，并从20赫兹到20千赫两个频带范围。
The filters are both continuously adjustable , with a range from 20 Hz to 20 kHz in two bands.
该过滤器都是连续可调，并从20赫兹到20千赫两个频带范围。
The filters are both continuously adjustable , with a range from 20 Hz to 20 kHz in two bands.
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