Z-10 attack helicopters and Z-20 utility helicopters attached to the Chinese PLA Army's Thunder Aerobatic Team fly in arrow formation during the 7th China Helicopter Exposition . (eng.chinamil.com.cn/Photo by Luan Cheng) 第七届中国国际直升机博览会于10月16日至19日在天津举办。图为陆军风雷飞行表演队直-10和直-20直升机箭头编队飞行。(英文中国军网/栾铖 摄)
