Apple's mobile phone WeChat group assistant sent a message on how to force the withdrawal.

This is irrevocable. Even if the message you sent is deleted, it can only be deleted from your own mobile phone. But the message you sent has been saved in the server, and it will still be stored in the other party's mobile phone. Because the sending record is not displayed, the next time you send it, be sure to see clearly that it is a mass delivery.

Hope to adopt