The Great Wall of China is an ancient wall composed mainly of pounded dirt and stone which is located in China and was built to protect the north of the empire of China from enemy attacks. It is the longest structure humans have ever built: stretching approximately 21,196 kilometres long, 30ft wide and 50ft high. The earlier sections on the wall are made of compacted dirt and stone later on in the Ming dynasty they used bricks. There are 7000 watch towers. There are block houses for soldiers and beacons to send smoke signals,the more smoke the more enemies.
Several walls, referred to as the Great Wall of China, have been built. The first was built in the 5th century BC. The most famous wall was built between 220–200 BC by the first Emperor of Imperial China, Qin Shi Huang. Little of this wall remains. It was much farther north than the current wall. The current wall was built during the Ming Dynasty.
The First Emperor of China started the Qin Dynasty. The Xiongnu tribes in the north of China (who are also called the Huns) were his enemies. Because the land in some parts of China is easy to cross, Qin Shi Huang began building the Great Wall to make it more difficult for the Xiongnu to invade China.
Other dynasties in China worked more on the wall and made it longer. The Han, Sui, Northern and Jin Dynasties all repaired, rebuilt or expanded the Great Wall. During the Ming Dynasty, major rebuilding work took place, where sections of the Wall were built with bricks and stone instead of earth.
六句話送給正在學習路上的你：
1、人最大的對手，就是自己的懶惰;
2，學習並不難，難的在于堅持；
3、堅持一下也不難，難的是堅持到底;
4、你全力以赴了，才有資格說自己不行;
5、感覺難，也許是因為你正處於學習的上坡路;
6、只有盡全力，才能迎來美好的明天。
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