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  很不错的二级导航菜单，部分代码使用CSS3书写，所以还是需要在火狐等支持CSS3浏览器下观看的哦。 二级导航菜单在切换的时候为上下翻滚效果。(Very good secondary navigation menu, part of the code is written in CSS3, so you still need to support CSS3 browser in Firefox, oh. The two level navigation menu is up and down when switching.)