原理上讲，有源滤波器可以达到很高的Q值，但是过高的Q值对于有源滤波器来说是不够稳定的。

In principle, active filter can achieve a high Q value, but high-Q active filter is not enough for the stable.

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但是我们看到如果，我们有一个自由电子，就像虚线所示那样，那将会是一个较高的，不够稳定的能量。

But we see if we have a free electron, as we do in this dotted line here, that's going to be a higher energy that's less stable.

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阿拉伯的投资者，包括科威特和阿联酋的主权基金在内，都表示愿意向诸如花旗银行(Citibank)和美林证券(Merrill Lynch)等不够稳定的美国信贷公司注入10亿美元。

Arab investors, including the sovereign funds of Kuwait and Abu Dhabi, sound willing to inject billions into wobbly American financial houses such as Citibank and Merrill Lynch.

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But we see if we have a free electron, as we do in this dotted line here, that's going to be a higher energy that's less stable.

但是我们看到如果,我们有一个自由电子，就像虚线所示那样，那将会是一个较高的,不够稳定的能量。

麻省理工公开课 - 化学原理课程节选

So, if we want to go from that stable state to that less stable state, we need to put in a certain amount of energy to our system, that difference between the free electron and the electron bound to the metal.

所以，如果我们想使电子,从稳态到达不够稳定的状态，我们需要引入一定数量的,能量到系统中，即自由电子和束缚于金属的,电子的能量差。

麻省理工公开课 - 化学原理课程节选