The wall is the oldest and most revolutionary architectural element.

未来是未知的，所以我们应该珍惜现在。

过去是一个陌生的国度；他们在那里做事的方式不同。

You can't go back and change the beginning, but you can start where you are and change the ending.

人们为了自己幸福，会让别人不幸。