An electron tube used to amplify or generate ultrahigh frequency by means of velocity modulation.

速调管一种用速度调节的方法放大或产生超高频率的电子管。

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For wireless digital communications, digital user signal is usually at first converted into analog domain and then modulated to radio frequency by one or two steps.

对于无线数字通信而言，通常将数字用户信号首先转换到模拟域中，然后通过一个或两个步骤将其调制到无线电频率。

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By default this value is set to 5 which means the governor will change the frequency by 5 percent of the maximum or minimum frequency each time it makes a decision to change frequencies.

在默认情况下，这个值设置为5，这意味着，在每次决定调整频率时，调控器调整频率的幅度为最大或最小频率的百分之5。

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What Einstein then clarified for us was that we could also be talking about energies, and he described the relationship between frequency and energy that they're proportional, if you want to know the energy, you just multiply the frequency by Planck's constant.

爱因斯坦阐述的是我们,也可以从能量的角度来谈论，他描述频率和能量之间的关系,是成比例的，如果希望知道能量值，你用普朗克常数乘以频率就可以了。

麻省理工公开课 - 化学原理课程节选

So that's the important take-away message from this slide. If we think about these different types of lights, microwave light, if it's absorbed by a molecule, is a sufficient amount of frequency and energy to get those molecules to rotate. That, of course, generates heat, so that's how your microwaves work.

重要的信息，如果我们看看,这些不同种类的光，微波,如果被分子吸收，它的频率和能量可以,使分子转动,这当然的，会产生热量,这就是你们微波炉的工作原理。

麻省理工公开课 - 化学原理课程节选

A food frequency--by the way, you also have the issue of whether the particular twenty-four hours that a person is interviewed is representative of their diet overall, because you can imagine how much your food intake varies from day to day.

食物摄取频率,顺便说下,还有一个问题,就是在选取的24小时里,测试者,是不是对总体有代表性,因为你可以想象,每天事物的摄入量都是不同的

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

VIENNA'S glories are largely faded but its name is being mentioned with increasing frequency by the euro area's policymakers.

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It will also tend to vibrate at a frequency determined by the weight of the object.

ECONOMIST: Small-scale physics

The pattern of damage was similar to the pattern of big-storm frequency uncovered by Dr Elsner.

ECONOMIST: Eye on the storm | The