Aerial photo taken on May 24, 2018 shows reapers harvesting wheat in the fields at Xi'ao Village of Qindong Town in Tongguan County, northwest China's Shaanxi Province. (Xinhua/Liu Xiao)

Aerial photo taken on May 24, 2018 shows reapers harvesting wheat in the fields at Xi'ao Village of Qindong Town in Tongguan County, northwest China's Shaanxi Province. (Xinhua/Liu Xiao)

Aerial photo taken on May 24, 2018 shows reapers harvesting wheat in the fields at Xi'ao Village of Qindong Town in Tongguan County, northwest China's Shaanxi Province. (Xinhua/Liu Xiao)

Aerial photo taken on May 24, 2018 shows reapers harvesting wheat in the fields at Xi'ao Village of Qindong Town in Tongguan County, northwest China's Shaanxi Province. (Xinhua/Liu Xiao)

Aerial photo taken on May 24, 2018 shows reapers harvesting wheat in the fields at Xi'ao Village of Qindong Town in Tongguan County, northwest China's Shaanxi Province. (Xinhua/Liu Xiao)