verb · closed off from the outside world or isolated from external input

这个偏僻的村庄处于一种相对封闭的状态。

verb · to close or seal off a physical entrance, space, or route

由于大雪，通往山区的道路已经封闭了。

verb · to close down an organization or illegal venue by official order

那家无证经营的工厂已被有关部门依法封闭。