Suppose The Great Wall of China is a series of fortifications made of stone, brick, tamped earth, wood, and other materials. The best-known fortification of the wall was built in the 14th through 17th centuries during the Ming Dynasty. The wall stretches over 13,000 miles and is a UNESCO World Heritage Site.
Can we infer that "The Great Wall of China was primarily built as a water source."? Yes, no, or maybe?