Above the navigation controls are four ICONS that allow users to download alternate versions of the tutorial or to E-mail the tutorial to a friend.
在导航控件上方是四个图标，允许用户下载教程的替代版本或将教程作为电子邮件发送给朋友。
Above the navigation controls are four ICONS that allow users to download alternate versions of the tutorial or to E-mail the tutorial to a friend.
在导航控件上方是四个图标，允许用户下载教程的替代版本或将教程作为电子邮件发送给朋友。
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