Answered by Daniel
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Feb. 13, 2019 17:53
1.It is a long way to go. The Great Wall is built at the border and the labors need to go a long way to get there.
2. The basic tools were not very useful and the productivity was very low.
3. The winter was cold and many labors just froze to death.
4. In the process of building, they may suffer attack from enemies.