A vehicle runs past Wuguan section of Lanzhou-Haikou expressway in Longnan City, northwest China's Gansu Province, Aug. 20, 2020. Five flood-affected expressways got repaired and resumed operation on Thursday, enabling rescue staff and goods to reach the flooded area soon. (Xinhua/Du Zheyu)

Aerial photo taken on Aug. 20, 2020 shows the restored Wuguan section of Lanzhou-Haikou expressway in Longnan City, northwest China's Gansu Province. Five flood-affected expressways got repaired and resumed operation on Thursday, enabling rescue staff and goods to reach the flooded area soon. (Xinhua/Du Zheyu)

Aerial photo taken on Aug. 20, 2020 shows the restored Wuguan section of Lanzhou-Haikou expressway in Longnan City, northwest China's Gansu Province. Five flood-affected expressways got repaired and resumed operation on Thursday, enabling rescue staff and goods to reach the flooded area soon. (Xinhua/Du Zheyu)

Aerial photo taken on Aug. 20, 2020 shows the restored Wuguan section of Lanzhou-Haikou expressway in Longnan City, northwest China's Gansu Province. Five flood-affected expressways got repaired and resumed operation on Thursday, enabling rescue staff and goods to reach the flooded area soon. (Xinhua/Du Zheyu)

Vehicles run past Wuguan section of Lanzhou-Haikou expressway in Longnan City, northwest China's Gansu Province, Aug. 20, 2020. Five flood-affected expressways got repaired and resumed operation on Thursday, enabling rescue staff and goods to reach the flooded area soon. (Xinhua/Du Zheyu)

Aerial photo taken on Aug. 20, 2020 shows the restored Wuguan section of Lanzhou-Haikou expressway in Longnan City, northwest China's Gansu Province. Five flood-affected expressways got repaired and resumed operation on Thursday, enabling rescue staff and goods to reach the flooded area soon. (Xinhua/Du Zheyu)

Vehicles run past Wuguan section of Lanzhou-Haikou expressway in Longnan City, northwest China's Gansu Province, Aug. 20, 2020. Five flood-affected expressways got repaired and resumed operation on Thursday, enabling rescue staff and goods to reach the flooded area soon. (Xinhua/Du Zheyu)

Aerial photo taken on Aug. 20, 2020 shows the restored Wuguan section of Lanzhou-Haikou expressway in Longnan City, northwest China's Gansu Province. Five flood-affected expressways got repaired and resumed operation on Thursday, enabling rescue staff and goods to reach the flooded area soon. (Xinhua/Du Zheyu)

Vehicles run past Wuguan section of Lanzhou-Haikou expressway in Longnan City, northwest China's Gansu Province, Aug. 20, 2020. Five flood-affected expressways got repaired and resumed operation on Thursday, enabling rescue staff and goods to reach the flooded area soon. (Xinhua/Du Zheyu)