Aerial photo taken on Nov. 10, 2019 shows a view of the Gongbei Port in Zhuhai, south China's Guangdong Province, and the Border Gate in Macao, south China. On Dec. 20, Macao will celebrate the 20th anniversary of its return to motherland. Over the past two decades, the special administrative region has made great strides in economic development and achieved prosperity and stability under the "one country, two systems" principle. (Xinhua/Cheong Kam Ka)