Email service: Subscribes to notifications with an email topic, and when it receives a notification message it sends it via email.
电子邮件服务：订阅具有一个电子邮件主题的通知，当该服务接收到一条通知消息时，它通过电子邮件发送该消息。
The email service is subscribed to all notifications with a "send email" topic.
电子邮件服务订阅所有具有 “sendemail”主题的通知。
The email service is subscribed to all notifications with a "send email" topic.
电子邮件服务订阅所有具有 “sendemail”主题的通知。
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