?递送服务的证明
... 递送公文的船 dispatch boat 递送服务的证明 proof of delivery service 递送急件的信差 courier ...
Check with the individual delivery service to find out how to get written proof of the mailing date and keep it handy with copies of your return.
FORBES: Tomorrow's Tax Deadline Pushed Off For Some Taxpayers
英汉双解词典包含3185865条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。