Photo taken on Dec. 1, 2020 shows a drone formation ready for testing at Tianjin EFY Technology Co., Ltd. in north China's Tianjin Municipality. The Binhai New Area in Tianjin has been actively boosting the development of drone industry in recent years by encouraging innovations among local companies. The district has built up a complete industrial chain of drone research, development, production and testing. (Xinhua/Zhao Zishuo)