The counter clerk will give you a certificate of posting which he has initiated with the date stamped.

柜台职员会给你一份他已经开始的并盖有日期戳的邮寄证明。

Hand the packet to the post office counter clerk together with the cost of postage and the registration fee.

把邮包连同邮资和挂号费一起交给邮局柜台职员。