麦凯恩说，奥巴马竞选以改变为主题，不过，美国人已经被他们经历的很多变化搞得烦恼不堪，从能源和食品价格的攀升，到失业不断地增长。
Noting that Obama has campaigned on the theme of change, McCain said Americans are distressed with many changes they now see, from high energy and food prices to job losses.
当牙钻的频率变化时，装置的波形也会迅速改变以适应从而保持无声。
As the drill’s frequency changes, the waveform quickly adapts to maintain the silence.
想象一下，Web客户端上单元格的值在你眼前发生变化，还会简单地改变颜色以提醒你有变更。
Imagine a web client where the cell values change in front of your eyes, and change color briefly to alert you to the change.
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