Aerial photo taken on March 14, 2018 shows a bullet train passes by rape flower fields while operating on the Xi’an-Chengdu high-speed line in Jiangyou, Southwest China’s Sichuan province.[Photo/Xinhua]

Aerial photo taken on March 14, 2018 shows a bullet train passes by rape flower fields while operating on the Xi’an-Chengdu high-speed line in Jiangyou, Southwest China’s Sichuan province.[Photo/Xinhua]

Aerial photo taken on March 14, 2018, a bullet train passes by rape flower fields while operating on the Xi’an-Chengdu high-speed line in Jiangyou, Southwest China’s Sichuan province.[Photo/Xinhua]

Aerial photo taken on March 14, 2018 shows a bullet train passes by rape flower fields while operating on the Xi’an-Chengdu high-speed line in Jiangyou, Southwest China’s Sichuan province.[Photo/Xinhua]