[Orgmode] Fold/unfold part of a paragraph

[Jianshi Huang]

Hello,

Is there a way to fold/unfold part of a paragraph? Something like a
headline but can be inlined in a paragraph.

For example, when folded, it will look like

  Here is the <<reason>>.

Where <<reason>> can be expanded to some full explanation.

And when exported, the full explanation will be used.


Jianshi