长城 The Great Wall

What impresses me most in Beijing is the Great Wall e the place of interest which attracts so many tourists both at home and abroad.

它始建于秦朝，一直延期到明清时期。在过去它是用来防止敌人的入侵，但现在它已成为名胜古迹，吸引了很多国内外游客。

When I was standing on the top of the Great Wall, I felt as if I were in ancient days. I could see many laborers working very hard. How could they finish this extremely difficult task by hand?

当我站在长城上时，我感觉我像是在古代一样。我可以看到很多劳动者努力工作。他们怎么能用手工完成这个艰巨的任务？