QINGDAO, China, Nov. 29, 2021 /PRNewswire/ -- Qingdao is located at the southern end of the Shandong Peninsular. It is an open coastal city with humanistic charm and advanced natural endowment in northern China. As a famous historical and cultural city in China, Qingdao is also an international port city. It has a land area of 11,000 square kilometers and a sea area of 12,000 square meters. There are seven districts and three county-level cities under its jurisdiction with a permanent resident population of 10.106 million. It is neither too...