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Community Bot的用户编号为$-1$
在Community Bot的个人简介 math.stackexchange.com/users/-1/community 有提到：
I'm a background process that helps keep this site clean!
I do things like
Randomly poke old unanswered questions every hour so they get some attention
我做的事情
每小时随机提出一些尚未解答的旧问题，以便引起人们的关注
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