它们“想”以小提琴琴弦一样的方式在给定的频率上进行振动——在小提琴中，以几乎任何形式馈入系统中的少量能量产生了振动。

They "want" to oscillate at a given frequency in the same way that a violin string does — a small amount of energy fed into the system, in almost any form, creates the oscillation.

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多模箱式再生系统中过滤体的尺寸可以不受安装空间的限制，并且可以采用多个微波源馈入功率以提高再生腔中的微波功率密度或改善加热均匀性。

In this system, the size of the filter is not limited by the space of installment and it is possible to heat of the filter by using more than one microwave power supply.

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此方法从干扰源处——接触网与受电弓之间馈入高频信号，由电气化铁道系统辐射出去进行测量。

According to the measurement method, feeding a rf sinusoidal signal at location of interference source, so this signal is radiated by electrified railway system.

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