Article 23. Undeliverable postal materials shall be returned to the senders.
Article 23. Undeliverable postal materials shall be returned to the senders.
第二十三条无法投递的邮件，应当退回寄件人。
Article 23. Undeliverable postal materials shall be returned to the senders.
第二十三条无法投递的邮件，应当退回寄件人。