火车是一个封闭的世界。
Facebook is still very much a closed world of its own.
Facebook仍然是一个非常封闭的网络。
Yet this world is not so closed as it seems.
然而，这个看似封闭的世界并不是滴水不漏的。
We are committed to staying together, but the world is really closed to us.
我们约定终身，但这个世界对我们关上了门。
Without friends, people will be permanently closed in their own world, unable to clear.
如果没有了朋友，人就会被永远封闭在自己的世界里，无法清醒。
Previously, my hometown was closed to the outside world.
以前，我的家乡与外界隔绝。
Previously, my hometown was closed to the outside world.
以前，我的家乡与外界隔绝。
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