Beijing, October 17 (Youth.cn) - On October 13 to 14, 2025, in Tianjin. The preview training sessions were held for the 7th China Helicopter Expo. The Expo officially took place from October 16 to 19 at the Tianjin Civil Helicopter Industrialization Base in Tianjin Airport Economic Area. The first two days were designated as trade days, followed by two days open to the general public. Photo/CFP