在交流电路中，电流的幅度是连续不断地变化的，因此相位和时间的概念变得十分重要了。

In ac circuits, the current amplitude changes continuously that the concept of phase or time becomes very important.

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随着每个连续不断地发生的变化，波及的环境逐渐扩大，而改变的效果也愈加明显。

With each successive change, the local environment becomes slightly larger and the effects slightly more pronounced.

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