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...