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之前看到过一个Announcement的讨论，但是已经关闭看不到了。 如果要让bot代发群公告，应该使用哪个接口。
为什么不去看文档
获取Announcements对象就可以，多看看源码注释 会有介绍的
@cssxsh 因为没看到T_T
