Servo motor has small start frequency, can quickly from the lowest revolution accelerated to the rated speed.

伺服电机有很小的启动频率，能很快从最低转速加速到额定转速。

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Start frequency, stop frequency and sweep time of the signal synthesized by the method can be preset freely and controlled accurately.

被合成的频率扫描信号的起始频率、终止频率和扫描时间可根据需要随意设定，并且可以实现对三者的精确控制。

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Chirp up down the chirp is played from start frequency to the end frequency and again to the start frequency in time defined by play chirp time.

短促声波结束短促声波从起动频率对结束频率播放，然后重新回到播放短促声波时定义的频率。

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So, if we start instead with talking about the energy levels, we can relate these to frequency, because we already said that frequency is related to, or it's equal to the initial energy level here minus the final energy level there over Planck's constant to get us to frequency.

如果我们从讨论能级开始，我们可以联系到频率上,因为我们说过频率和能量相关,或者说等于初始能量,减去末态能量除以普朗克常数。

麻省理工公开课 - 化学原理课程节选

So this is our final equation, and this is actually called the Balmer series, which was named after Balmer, and this tells us the frequency of any of the lights where we start with an electron in some higher energy level and we drop down to an n final that's equal to 2.

把2代入到这里，所以得到1除以,这就是我们最终的方程，这叫做Balmer系，以Balmer名字命名的,它告诉我们从高能级掉到n等于2的,最终能级所发出光的频率。

麻省理工公开课 - 化学原理课程节选

The engineers found a way to kick-start a radio-frequency device wirelessly using an external power source initially, but running the device afterward on the output of power generated by the inner ear.

WSJ: Harnessing Energy From the Body to Power Devices

As the variations or short-term disturbances in frequency increase, electronic devices start to malfunction, experience reduced performance and, in extreme cases, suffer permanent damage.

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They can start by making markets coordinate and making high-frequency traders maintain orderly markets.

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