To learn more about these tree types, view our Christmas tree photo slide show.

想了解更多品种的松树，点击“圣诞树图片集锦”观看。

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View a slide show of the world's worst toxic pollution problems

请看世界最严重有毒污染问题的图片说明

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In slide sorter view, select the first slide in each custom show you just created.

在幻灯片浏览视图中，选择刚创建的每个自定义放映的第一张幻灯片。

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In slide sorter view, select the first slide in each custom show you just created.

在幻灯片浏览视图中，选择刚创建的每个自定义放映的第一张幻灯片。

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