def send_single_text(self, sender, receiver, content):
        """
        发送单聊文本消息

        :param sender: 发送人
        :param receiver: 接收人成员 ID
        :param content: 消息内容
        :return: 返回的 JSON 数据包
        """
        return self.send_text(sender, 'single', receiver, content)