What does to touch on mean like this example? a interesting topic touching on everything you have mentioned

Minhi

2015年4月1日 08:25

I'd understand it as 'referring to'.

2015年4月1日

the context is missing, so it could be one of these example, or a similar variation: an interesting topic - which is relevant to - everything you have mentioned an interesting topic - which refers to - everything you have mentioned an interesting topic - which is linked to - everything you have mentioned

2015年4月1日

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