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rt，CommandSender似乎是User?类型，与At()参数类型不一样，并不能直接调用 且我没有找到该如何获得CommandSender的QQ号码或者将CommandSender转换成UserOrBot类型
new MessageChainBuilder().append(new At(groupMessageEvent.getSender().getId())......
CommandSender.user, 请善于翻源码定义
