That appears to be a Google AdSense ad, do you have the Ads Plugin installed?
Yes, I installed the ad plug-in. But I didn’t use it. These ads appear after I install some themes and components.
I want to know if there are some themes, components. With advertising。 
They shouldn’t exists, but, if you’re not using the plugin try removing it.
Where is the Discourse hosted? Maybe the hosting adds the ads?
ok, thank you. I’ll check。
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