For service by post, an accepting institution must keep the postal certificate.

受理机构邮寄送达的，必须保留邮寄凭证。

youdao

Attention: Paper certificate and crystal card cannot be sent to post-office p. o. box.

注意：纸质证书和水晶牌不能被寄到邮局的邮政信箱。

youdao

Attention: Paper certificate and crystal card cannot be sent to post-office p. o. box.

注意：纸质证书和水晶牌不能被寄到邮局的邮政信箱。

youdao