I hope that when I mouseover the link, I can preview the thumbnail of the content . At present, mouseover to the link can only preview the hierarchy of the article。
If you are talking about internal links (Rem References) then this setting is already implemented. 
Go to Settings → Interface → Full Page Preview to enable it.
If you are talking about external links, then yeah, it would be really nice, albeit unsure of the logics behind making it work. Have not seen it implemented in most apps/sites.
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I found it. Thank you so much. This feature is not mentioned in the Chinese tutorial。 
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