如果电源电压减小，则选择信号的状态从逻辑高改变为逻辑低。

If the power supply voltage decreases, the state of the select signal is changed from a logic high to a logic low.

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在过去的低速率的美好日子里，我们可以把数字信号想象成像直流信号一样，逻辑高时开，逻辑低时关。

In the good old days, we could think of digital signals as though they were DC signals that turned on and off with logic-highs and logic-lows.

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这样永无止尽的惊奇不断延续，但逻辑等级一次比一次高。

Throughout all eternity surprise continues, but each time at a higher logical level.

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