This paper reviews Post closed classes and the achievements in research on the discrete predicative systems, puts forward new questions and and applicable prospects of the research.

概述波斯特封闭类与离散谓词系统的研究成果，提出这类研究中的新问题和应用前景。

youdao

She rushed to get to the post office before it closed.

她赶在邮局关门之前到达邮局。

《柯林斯英汉双解大词典》

A couple of years ago, if I was reading a post like that my mind would be so closed that I would not have clicked through to the site.

要是在几年前，如果我看到这样的帖子，我绝对不会去点击查看它，因为那时候我的思想非常地封闭。

youdao

Their union said it was a long-standing tradition that main post offices closed on Christmas Eve at 1230 GMT.

BBC: NEWS | UK | Wales | Road delays warning for getaway

And, specifically, does he agree -- or does he agree with the approach taken that some people in rural areas object to, and that is they -- that they are being inordinately asked to bear a greater burden by having their local post offices closed under the plan that was put forward today?

WHITEHOUSE: Press Briefing by Deputy Press Secretary Josh Earnest

Even the U.S. Postal Service closed post offices and suspended mail delivery Saturday in New England.

WSJ: Storm Sweeps Through Northeast U.S.