Buses drive into a cargo ship at a port in Lianyungang, east China's Jiangsu Province, June 12, 2017. A total of 600 buses were exported to Saudi Arabia Monday from Lianyungang port. (Xinhua/Li Bo)

Buses drive into a cargo ship at a port in Lianyungang, east China's Jiangsu Province, June 12, 2017. A total of 600 buses were exported to Saudi Arabia Monday from Lianyungang port. (Xinhua/Wang Jianmin)

Buses drive into a cargo ship at a port in Lianyungang, east China's Jiangsu Province, June 12, 2017. A total of 600 buses were exported to Saudi Arabia Monday from Lianyungang port. (Xinhua/Wang Jianmin)

Buses to be exported are seen at a port in Lianyungang, east China's Jiangsu Province, June 12, 2017. A total of 600 buses were exported to Saudi Arabia Monday from Lianyungang port. (Xinhua/Li Bo)