通过拖动滑块按时间浏览可视化地图，或者按下播放按钮显示动画。

Move through the visualization in time by dragging the slider, or press the play button to show an animation.

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现在想想iPhone，它里面的嵌入视频会在透明薄层下显示一个漂亮的播放按钮，点击后视频会全屏。

Now consider the iPhone, where an embedded video will display a nice play button in its overlay, the tapping of which will grow the video to fill the tiny screen.

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图像将被显示，声音将有一个播放按钮。

The image will be shown, the sound file will have a play button.

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