A CH-5 combat drone is on public display at the Zhuhai Air Show in Zhuhai city, South China's Guangdong province on Oct 31, 2016. CH-5, twice as big as its predecessors, can stay in the air for 60 hours and go up to 10 km high. It's believed to be one of the most powerful unmanned combat aircraft in the world.[Photo by Feng Yongbin/China Daily]