Explanation: low wall, wall; City; Official office; In ancient times, the stars were divided into upper, middle and lower three walls; Last name.

Make sentences:

1, or sneaking through the vast Mongolian grassland under the witness of the ruins of the Great Wall?

2. The ancient battlefield, which was once ruined and covered with corpses, has now been built with high-rise buildings and taken on a new look.

3. After the war, there were only a few crumbling ruins standing in the rubble.

4. Schiller once thought that the chorus is a living wall.

5. It's a pity that these bows and arrows are scattered above the wall, some nailed to the wall, and some nailed to the middle of the wall, hardly hurting the soldiers of the storm army.

6. Three days later, the gate of Yancang was closed by us and a four-fold deer wall was built.