上例中的图书包含一个地图和一个主题。

The sample book above includes one map and one topic.

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其中的主题或者地图个数没有限制。

This can happen with any number of topics or maps.

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为自己设计的主题公园画一幅地图，并制作一份海报作宣传。

Make a map of your theme park. Make a poster to advertise it.

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点击主题即可浏览相应地图。

Clicking a map title will begin your browsing at that map.

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点击主题即可浏览相应地图。

Clicking a map title will begin your browsing at that map.

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